The MagSup team was born from the fusion in 2014 of three teams of experimentalists working on condensed matter physics, from fundamental properties to applications. Over the last five years, we have strengthened our ties within the team while the diversity of cultures of the three original groups allowed novel fruitful approaches. Our team is the largest of the Neel Institute, with 25 CNRS and University researchers and more than 10 student and post-docs.
The research activity of the team can be decomposed into four main topics:
Our objective is to understand and to manipulate the fundamental properties, which emerge from microscopic interactions and or from the interplay between several degrees of freedom (charge, spin, orbital, lattice) in a great variety of strongly correlated electrons systems. These are materials such as transition metals oxides, compounds of actinides or rare-earths, or disordered systems. These systems exhibit unconventional properties of magnetism, superconductivity, charge orderings, with several coexisting orders sometimes strongly coupled and/or in competition due to magnetic frustration. Our microscopic understanding of the fundamental states and associated excitations is established in strong connection with theoreticians and allows us, in collaboration with chemists, to foresee and study in depth new systems. Eventually, we simulate and manipulate the functionalities of these materials to create new devices.
We also develop an original instrumentation in the laboratory and use large scale facilities (neutron sources, synchrotron, intense magnetic field), in extreme conditions of magnetic fields, (low) temperature and pressure. The team is perfectly established in its Grenoble environment. It interacts narrowly through experimental developments and joint doctoral and scientific projects, within Institut Néel, but also with the LNCMI, G2Elab, CEA’s IRIG teams and European large scale facilities, ESRF and ILL. We also play an essential role in structuring and animating local, national and international science in organising seminars, conferences and schools, but also in participating in commissions and management positions.
Our approach is transversal from elaboration/chemistry and physical characterizations to the realization, implementation and tests of large-scale models or major demonstrators through functional property characterizations (transport, AC losses…), design and modeling. The collaboration of different research activities (material, simulation of physical properties) aims to understand the materials and physics in view to better innovating devices and to adapt or optimize the material properties in function of the targeted applications. We have an important action in the scientific animation of the applied superconductivity community both on national and international levels.
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Associated staff: Florence Levy-Bertrand (MagSup), Thierry Klein (MagSup), Pierre Rodière (MagSup), Alessandro Monfardini (Helfa), Alain Benoit (Helfa), Johannes Goupy (Helfa), Martino Calvo (Cryogénie), Philippe Camus (Cryogénie).
Student: Usasi Chowdhury (Helfa).
Kinetic Inductance Detectors (KIDs) are a particular implementation of superconducting resonators. Superconducting microwaves resonators are superconducting thin films deposited onto insulating substrates patterned into LC circuits. Their resonance frequency is 2Πf = (LC)-1/2 and they can achieved quality factor up to few millions. The KID detector has been proposed by the Caltech-JPL group in 2001. Photon detection is realized by monitoring variations of the resonance frequency. The incident light breaks down Cooper pairs, modifying the kinetic inductance L and thus the resonance frequency.
We develop KIDs (mainly) for millimeter wave observations in astrophysics, particles detection and fundamental superconductivity studies.
Collaborations: IRAM, LPSC, IPAG (Grenoble), IRAM (Granada), LAM (Marseille), LLAMA Consortium (Brazil-Argentina), APC (Paris), IAS, CSNSM (Orsay), Cardiff University (UK), SRON (Holland) , CAB (Madrid), Arizona State University (US), CNES, IRAP (Toulouse), Università di Roma, KIT (Karlsruhe), LAHC (Chambery), CEA-Irfu (Saclay).
Links:
Highlights 2017 : New SKID-detectors: a world below the superconducting gap
Highlights 2016 : NIKA2: revolutionary camera for millimeter waves sees first light
Highlights 2014 : New mm-wave instrument (”NIKA”) opens for astronomers
Selected publications:
Contact-less phonon detection with massive cryogenic absorbers, Johannes Goupy, J. Colas, M. Calvo, J. Billard, P. Camus, R. Germond, A. Juillard, L. Vagneron, M. De Jesus, F. Levy-Bertrand and A. Monfardini, Appl. Phys. Lett. 115, 223506 (2019). [APL, ArXiv]
Electrodynamics of granular aluminum from superconductor to insulator: observation of collective superconducting modes, F. Levy-Bertrand, T. Klein, T. Grenet, O. Dupre, A. Benoît, A. Bideaud, O. Bourrion, M. Calvo, A. Catalano, A. Gomez, J. Goupy, L. Grunhaupt, U. v. Luepke, N. Maleeva, F. Valenti, I. M. Pop, and A. Monfardini, Physical Review B 99, 094506 (2019). [PRB, ArXiv]
The NIKA2 large-field-of-view millimetre continuum camera for the 30 m IRAM telescope, R. Adam, A. Adane, P.A.R. Ade, P. André, A. Andrianasolo, H. Aussel, A. Beelen, A. Benoit, A. Bideaud, N. Billot, O. Bourrion, A. Bracco, M. Calvo, A. Catalano, G. Coiffard, B. Comis, M. De Petris, F.-X. Désert, S. Doyle, E.F.C. Driessen, R. Evans, J. Goupy, C. Kramer, G. Lagache, S. Leclercq, J.-P. Leggeri, J.-F. Lestrade, J.-F. Macias-Perez, P. Mauskopf, F. Mayet, A. Maury, A. Monfardini, S. Navarro, E. Pascale, L. Perotto, G. Pisano, N. Ponthieu, V. Reveret, A. Rigby, A. Ritacco, C. Romero, H. Roussel, F. Ruppin, K. Schuster, A. Sievers, S. Triqueneaux, C. Tucker, R. Zylka, A&A, vol. 609, p. A115 (2018). [AA, ArXiv]
Tunable sub-gap radiation detection with superconducting resonators, O. Dupré, A. Benoît, M. Calvo, A. Catalano, J. Goupy, C. Hoarau, T. Klein, K. Le Calvez, B. Sacépé, A. Monfardini and F. Levy-Bertrand, Supercond. Sci. Technol. 30, 045007 (2017). [SST, ArXiv]
Superconductivity is a state of matter corresponding to zero electrical resistance and magnetic field expulsion occurring in some materials cooled down below a critical temperature. Microscopically, it corresponds to a condensate of electron pairs. Such a condensate of fermions can occurred only because electron paired up to form Cooper pairs. In conventional superconductors, the glue binding the electron pairs is the exchange of lattice vibrations: the phonons.
Counterintuitively the materials achieving the highest critical temperatures at ambiant pressure are not the metallic ones, but rather ceramic materials: the high temperature superconductors or cuprates. A priori, the conventional electron-phonon coupling mechanism cannot explain Cooper pairing in cuprates.. Unraveling the mystery of the physical mechanism leading to high temperature superconductivity remains one of the most challenging issues of modern solid-state physics.
In order to unveil the mechanism leading to high temperature superconductivity we look at different family of compounds by means of complementary probes. Indeed, in many strongly correlated electron systems, from heavy fermions to pnictides, including high temperature superconductors, superconductivity seems to be linked to the vicinity of an electronic or magnetic instability. The nature of the instability varies, ranging from antiferromagnetic order, to charge or spin density waves, including a pseudo-gap state or a metamagnetic transition. Those observations suggest that electronic or magnetic fluctuations may be involved in the pairing mechanism. The general aim is to determine the microscopic ingredients involved in both the formation of superconductivity and the electronic/magnetic states of each families.
Associated staff: Marie-Aude Méasson (MagSup), Florence Levy-Bertrand (MagSup)
Student: Gregory Setnikar (MagSup)
Collective modes which emerge at a quantum phase transition are fundamental witnesses of their underlying quantum electronic phase. Notably for the superconducting state, they are expected to provide crucial information on its symmetry, on the pairing mechanism, on the effect of disorder, or on the interplay with coexisting electronic phases. Besides one of these modes, the fluctuations of the amplitude of the superconducting order parameter, is a historical analogous of the Higgs boson which still remains elusive to experimental validation.
In this growing field of research, our approach is to look for and to study sub-gap superconducting modes thanks to state-of-the-art spectroscopic probes, Raman and sub-THz spectroscopy.
Notably, in the field of disorder superconductors, we provide direct evidence for well resolved sub-gap absorptions in superconducting granular aluminium thanks to an original high resolution optical spectroscopy technique. We demonstrated two different types of sub-gap excitations below twice the superconducting gap 2∆, occurring at ω1 ≈ ∆ and ∆ < ω2 < 2∆. The nature of these excitations is unclear and under investigation.
In the quest of superconducting Higgs modes, we demonstrate that its observation could rely on the presence of an electron-phonon-coupled quantum order (charge density wave) coexisting with the superconductivity, whose collective mode couples to the Higgs one. It thus yields a signature in the Raman probe. Two examples are now present in the literature (Cf. ref. below), both in the dichalcogenides family. Our goal (ERC project HiggS²) is to fully address the Higgs mode nature and mechanism of observability in a variety of superconducting systems using Raman probe under extreme conditions.
Collaborations: Lara Benfatto (La Sapienza, Rome), Ioan Pop (KIT, Karlsruhe), Eugenio Coronado (ICMol, University of Valencia), Laurent Cario (IMN, Nantes).
Selected publications:
Pressure induced collapse of the charge density wave and Higgs mode visibility in 2H-TaS2, Grasset, Y. Gallais, A. Sacuto, M. Cazayous, S. Mañas-Valero, E. Coronado and M.-A. Méasson, Phys. Rev. Lett. 122, 127001 (2019). [PRL, ArXiv]
Electrodynamics of granular aluminum from superconductor to insulator: observation of collective superconducting modes, F. Levy-Bertrand, T. Klein, T. Grenet, O. Dupre, A. Benoît, A. Bideaud, O. Bourrion, M. Calvo, A. Catalano, A. Gomez, J. Goupy, L. Grunhaupt, U. v. Luepke, N. Maleeva, F. Valenti, I. M. Pop, and A. Monfardini, Physical Review B 99, 094506 (2019). [PRB, ArXiv]
Circuit Quantum Electrodynamics of Granular Aluminum Resonators, N. Maleeva, L. Grünhaupt, T. Klein, F. Levy-Bertrand, O. Dupré, M. Calvo, F. Valenti, P. Winkel, F. Friedrich, W. Wernsdorfer, A. V. Ustinov, H. Rotzinger, A. Monfardini, M. V. Fistul, and I. M. Pop, Nature Communications 9, 3889 (2018). [Nat. Com., ArXiv]
Higgs-mode radiance and charge-density-wave order in 2H-NbSe2, Grasset, T. Cea, Y. Gallais, M. Cazayous, A. Sacuto, L. Cario, L. Benfatto and M.-A. Méasson, Phys. Rev. B 97, 094502 (2018). [PRB, ArXiv]
Fundings:
ERC grant HiggS² (2020-2025) : Superconducting Higgs mode
ANR SEO-HiggS² (2017-2021)
Associated staff: Thierry Klein, Mattéo d’Astuto, Manuel Nunez-Regueiro, Christophe Marcenat (CEA)
The discovery of a charge ordered phase associated to a major Fermi surface reconstruction in underdoped cuprates recently revived the debate on the pairing mechanism in high-Tc superconductors, still one of the most challenging issue in modern solid-state physics.
Indeed, as in most of the unconventional materials, high-Tc superconductivity appears in the vicinity of a competing instability, but in the case of cuprates, not one but several instabilities compete with the superconducting phase, including this charge ordered phase, antiferromagnetic and spin ordered phases as well as a still very enigmatic pseudo-gap phase.
The three central phenomena of high-Tc cuprate are then linked by a common doping p* around which the superconducting phase forms a dome, the resistivity exhibits an anomalous linear dependence on temperature and where the pseudo-gap phase ends. However, the fundamental nature of p* remains unclear, in particular whether it marks a true quantum phase transition is still debated.
Unravelling the mystery goes through a better understanding of the normal state giving rise to superconductivity. Unfortunately, superconductivity is very robust and studying this normal state requires for instance the use of very high magnetic fields and hence of instrumental probes adapted to those extreme conditions.
We performed extensive studies of the normal state electronic contribution to the specific heat in various cuprates. We have then recently shown that the interplay between superconductivity and the charge ordered phase leads to an unusual S-shape of the transition line between the superconducting and normal states, indicating that those two exclusive orders finally establish a form of cooperation in order to coexist at low T.
We also showed that the Sommerfeld coefficient displays a pronounced peak in the vicinity of p* in several cuprates (at very low temperature), associated with a logT dependence of the specific heat, two classical features of the existence of a quantum critical point (QCP). The broken symmetry associated to this possible QCP is still unknown but the (quantum) fluctuations could be involved in both d-wave pairing and the anomalous scattering of charge carriers.
Another approach consists in looking to a model systems: cuprates oxychlorides. Oxychlorides are unique among the high temperature superconducting cuprates (HTSCs) since they: lacks high Z atoms; have a simplest crystalline structure for cuprates, stable at all doping and temperatures; and have a strong 2D character due to the replacement of apical oxygen with chlorine. Therefore, advanced calculations that incorporate correlation effects, such as Quantum Monte Carlo and Dynamical Mean Field Theory (DMFT) are easier. However, relatively little is known about Ca2CuO2Cl2 from an experimental point of view. We are now filling this gap by a comprehensive experimental study covering the whole phase diagram, in particular of the magnon and phonon dispersion as well as their electronic structure, using advanced approaches based on synchrotron and laboratory spectroscopies. In this context, a particular experimental effort has been focused recently in probing their elusive bulk charge ordered phase, and related excitation, using Resonant Inelastic X-ray Scattering.
Tools:
Main Collaborations:
Links:
Highlights 2016: The enigmatic normal state of high temperature superconductors
Highlights 2019: The enigmas of high temperature superconductivity
Selected publications:
Calorimetric détermination of the magnetic phase diagram of underdoped ortho II YBa2Cu3O6.54 single cystals, C. Marcenat, A. Demuer, K. Beauvois, B. Michon […] and T. Klein, Nature Communications 6, 7927 (2015). [NatureCom]
Resonant inelastic x-ray scattering study of spin-wave excitations in the cuprate parent compound Ca2CuO2Cl2, B. W. Lebert, M. P. M. Dean, A. Nicolaou, J. Pelliciari, M. Dantz, T. Schmitt, R. Yu, M. Azuma, […] and M. d’Astuto, Physical Review B 95, 155110 (2017). [PRB, HAL]
Unusual Interplay between Superconductivity and Charge Order in YBa2Cu3Oy, J. Kačmarčík, B. Michon, […] M.-H. Julien, C. Marcenat, and T. Klein, Physical Review Letters 121, 167002 (2018). [PRL, Arxiv]
Thermodynamic signature of quantum criticality in cuprates, B. Michon, C. Girod, S. Badoux, J. Kačmarčík […] C. Marcenat, L. Taillefer, T. Klein, Nature 567, 218 (2019). [Nature, Arxiv]
Doping induced in-plane anisotropy of bond-stretching phonon softening in oxychlorides Ca2CuO2Cl2, B. W. Lebert, H. Yamamoto, M. Azuma, R. Heid, […] and M. d’Astuto, Physical Review B, 101, 020506(R) (2020). [PRB, HAL]
High density of states in the pseudogap phase of HgBa2CuO4+d from specific heat, C. Girod, A. Legros, […] C. Marcenat, L. Taillefer, and T. Klein, Physical Review B 102, 014506 (2020). [PRB, Arxiv]
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Associated staff: Carley Paulsen, Klaus Hasselbach, Pierre Rodière, Marie-Aude Méasson, Florence Lévy-Bertrand
Heavy-fermion systems are intermetallic materials composed of rare earths (Ce, Yb) or actinides (U,…) elements. In these systems, partially filled 4f- or 5f-electron orbitals are strongly-coupled to conduction-electrons bands. Electronic interactions give rise to the formation of heavy quasiparticles, i.e., narrow electronic bands with a strong enhancement of the effective mass m∗ , which typically reaches 100 to 1000 times the value of the free-electron mass m0. Since their discovery in the 1980’, more and more heavy-fermion compounds are founds that are superconducting, some are even ferromagnetic and superconducting simultaneously. Heavy-fermion compounds are expected to host spin triplet superconductivity, equal spin pairing, and to present effects of topology, chirality and potentially edge states. Heavy-fermions are ideal platforms to study fundamental concepts of Quantum Matter.
Tools:
These unique instruments were built by us and are part of the European MicroKelvin Platform.
Main Collaborations:
Links (if nothing appears, look in your download folder):
Highlights 2006: Magnetic Imaging of unconventional superconductors
Highlights 2018: Scanning Hall Probe microscopy
Selected publications:
Anomalous anisotropy of the lower critical field and Meissner effect in UTe2, C. Paulsen, Georg Knebel, G. Lapertot, D. Braithwaite, A. Pourret et al., Physical Review B 103, L180501 (2021). [PRB, HAL]
Type-I superconductivity in the Dirac semimetal PdTe2, H. Leng, C. Paulsen, Y. Huang, A. de Visser, Physical Review B 96, 220506 (2017). [PRB, HAL]
Visualization by scanning SQUID microscopy of the intermediate state in the superconducting Dirac semimetal PdTe2, P. Garcia-Campos, Y. Huang, A. de Visser, Klaus Hasselbach, Physical Review B 103, 104510 (2021) [PRB, HAL]
MicroSQUID Force microscopy in a dilution refrigerator, Danny Hykel, Zhao-Sheng Wang, Pauline Castellazzi, Thierry Crozes, Gorky Shaw et al., Journal of Low Temperature Physics 175, 861 (2014). [JLTP, HAL]
Pairing mechanism in the ferromagnetic superconductor UCoGe, Beilun Wu, Gael Bastien, Mathieu Taupin, Carley Paulsen, Ludovic Howald, Dai Aoki, Jean-Pascal Brison, Nature Comm. 8, 14480 (2017). [NatCom, HAL]
Determination of spin and orbital magnetization in the ferromagnetic superconductor UCoGe, M. W. Butchers, J. A. Duffy, J. W. Taylor, S. R. Giblin, S. B. Dugdale, C. Stock, P. H. Tobash, E. D. Bauer, C. Paulsen, Physical Review B 92, 121107(R) (2015). [PRB, Condmat]
Magnetic and superconducting phase diagram of the half-Heusler topological semimetal HoPdBi, A. M. Nikitin, Y. Pan, X. Mao, R. Jehee, G. K. Araizi, Y. K. Huang, C. Paulsen, S. C. Wu, B. H. Yan, A. de Visser, J. Phys.: Condens. Matter 27, 275701 (2015). [JPCM, Condmat]
Magnetic fields above the superconducting ferromagnet UCoGe, D. Hykel, C. Paulsen, D. Aoki, J. R. Kirtley, Klaus Hasselbach, Physical Review B 90, 184501 (2014). [PRB, HAL]
Low field magnetic response of the non-centrosymmetric superconductor YPtBi, T. V. Bay, M. Jackson, C. Paulsen, C. Baines, A. Amato, T. Orvis, M. C. Aronson, Y. K. Huang, A. de Visser, Solid State Communications 183, 13 (2014). [SSC, Condmat]
Superconductivity and magnetic order in the non-centrosymmetric Half Heusler compound ErPdBi, Y. Pan, A. M. Nikitin, T. V. Bay, Y. K. Huang, C. Paulsen, B. H. Yan, A. de Visser, Europhysics Letters 104, 27001 (2013). [EPL, Condmat]
Observation of the Meissner-Ochsenfeld Effect and the Absence of the Meissner State in UCoGe, Carley Paulsen, Danny Hykel, Klaus Hasselbach, Dai Aoki, Physical Review Letters 109, 237001 (2012). [PRL, HAL]
Field-Induced Phenomena in Ferromagnetic Superconductors UCoGe and URhGe, D. Aoki, M. Taupin, C. Paulsen, F. Hardy, V. Taufour et al., J. Phys. Soc. Jpn 81, SB002 (2012). [JPSJ, HAL]
Associated staff: Pierre Rodière, Manolo Núñez-Regueiro, Marie-Aude Méasson, Christine Opagiste
A charge density wave is a Fermi surface instability due to a large electronic susceptibility in metallic systems. This long range order induces the opening of a gap at the Fermi level to reduce the electronic energy. Thanks to an electron-phonon coupling, the charge density wave is associated to a lattice distortion. Both phenomena modify strongly the electronic structure of the system. This distortion gives often rise to an aperiodic structure and a peculiar lattice dynamic. Moreover, by applying an external tuning parameter the lattice distortion can be tuned to 0K inducing a quantum phase transition. Numerous of these metallic systems exhibit also superconducting properties at proximity of this quantum phase transition.
Several fundamental questions raised in these systems. What is the role of the aperiodic structure of the system and the breakdown of the Bloch theorem? How is the phase diagram of these systems? What are the consequences of the presence of the soft phonon modes on the superconducting state? How the disorder affects these orders? What are the emerging excitations of the coexistence of the charge density wave and the superconductivity? What is the influence of the dimensionality? What laws govern the quantum phase transition from CDW to superconductivity under an external parameter such as pressure? What is the role of CDW’s in high temperature superconducting cuprates?
In the MagSup team, we are studying these phenomena on a large number of systems ranging from the transition metal dichalchogenides, to intermetallic with or without strong electronic couplings. We are growing single crystal and using transport, thermodynamic and spectroscopy techniques in extreme of low temperature and high pressures conditions.
Tools:
Links:
International Research Network : Aperiodic
Highlight 2016 : Influence of lattice vibrations on quantum phase transitions
Publications:
Charge Order and Suppression of Superconductivity in HgBa2CuO4+d at High Pressures, M. Izquierdo, DC. Freitas, D. Colson, G. Garbarino, A. Forget, H. Raffy, J-P. Itié, S. Ravy, P. Fertey, M.Núñez-Regueiro, Cond. Matt. 6, 25 (2021). [CondMatt, Condmat]
Charge density wave and superconductivity competition in Lu5Ir4Si10: A proton irradiation study, M. Leroux, V. Mishra, C. Opagiste, P. Rodière, A. Kayani, WK Kwok, U. Welp, Phys. Rev. B 102, 094519 (2020). [PRB, Condmat]
Pressure-Induced Collapse of the Charge Density Wave and Higgs Mode Visibility in 2H-TaS2, R. Grasset, Y. Gallais, A. Sacuto, M. Cazayous, S. Manas-Valero, E. Coronado, M.A. Measson, Phys. Rev. Lett. 122, 127001 (2019). [PRL, Condmat]
Traces of charge density waves in NbS2 , M. Leroux, L. Cario, A. Bosak, P. Rodière, Phys. Rev. B 97, 195140 (2018). [PRB, HAL]
Strong enhancement of superconductivity at high pressures within the charge-density-wave states of 2H-TaS2 and 2H-TaSe2, D.C. Freitas, P. Rodière, M.R. Osorio, E. Navarro-Moratalla, N.M Nemes, V.G. Tissen, L. Cario, E. Coronado, M. Garcia-Hernandez, S. Vieira, M. Núñez-Regueiro, H. Suderow, Phys. Rev. B 93, 184512 (2016). [PRB, HAL]
Strong anharmonicity induces quantum melting of charge density wave in 2H−NbSe2 under pressure, M. Leroux, I. Errea, M. Le Tacon, S.M. Souliou, G. Garbarino, L. Cario, A. Bosak, F. Mauri, M. Calandra, P. Rodière, Phys. Rev. B 92, 140303(R) (2015). [PRB, HAL]
Experimental consequences at high temperatures of quantum critical points, D.C. Freitas, P. Rodiere , M. Nunez, J. Marcus, F. Gay, M. Continentino , M. Núñez-Regueiro, Phys. Rev. B 92, 205123 (2015). [PRB, Condmat]
Extension of Bilbro-McMillan charge density wave-superconductivity coexistence relation to quantum regimes: Application to superconducting domes around quantum critical point, M. Núñez-Regueiro, J. Mag. Mag. Mat. 25, 375 (2015). [JMagMagMat, HAL]
Amplitude Higgs mode in the 2H-NbSe2 superconductor, M.A. Measson, Y. Gallais, M. Cazayous, B. Clair, P. Rodiere, L. Cario, A. Sacuto, Phys. Rev. B 89, 060503 (2014). [PRB, HAL]
Pressure dependence of superconducting critical temperature and upper critical field of 2H-NbS2 , V.G. Tissen; M.R. Osorio, J.P. Brison, N.M. Nemes, M. Garcia-Hernandez, L. Cario, P. Rodière, S. Vieira, H. Suderow, Phys. Rev . B 87, 134502 (2013). [PRB, Condmat]
Quantum critical point and superconducting dome in the pressure phase diagram of o-TaS3, M. Monteverde, J. Lorenzana, P. Monceau , M. Núñez-Regueiro, Phys. Rev. B 88, 180504(R) (2013). [PRB, HAL]
Anharmonic suppression of charge density waves in 2H-NbS2, M. Leroux, M. Le Tacon, M. Calandra, L. Cario, M.A. Measson, P. Diener, E. Borrissenko, A. Bosak, P. Rodière, Phys. Rev. B 86, 155125 (2012). [PRB, HAL]
Associated staff: Florence Levy-Bertrand (MagSup), Thierry Klein (MagSup), Hervé Cercellier (MagSup), Christophe Marcenat (MagSup), Etienne Bustarret (SC2G), Julien Pernot (SC2G), Xavier Blase (TMC), Benjamin Sacépé (QuNES).
Counterintuitively, at ambient pressure, the materials achieving the highest critical temperatures are not the metallic ones, but rather ceramic materials. The high Tc or cuprates look like slate and copper or gold show no sign of superconductivity. Such observations suggest that superconductivity is a subtle balance between the electronic density, the electronic interactions (Coulomb repulsion and Coulomb screening) and the electron-phonon coupling (or some electron-boson coupling).
Besides the intrinsic materials properties, disorder can turn a superconductor into an insulator resulting in an electrical resistance spanning all the way from zero to infinity. The physical mechanism triggering the transition between those two states of matter is still highly debated. Superconductivity is not affected by a small amount of disorder but strong disorder gives rise to unscreened coulomb repulsions generating classic Anderson insulating states, possible electron glass states, or Cooper-pair insulators (see associated part in electronic correlation section). Even more puzzling, in some superconductors, moderate disorder can even enhanced superconductivity. Such observations encourage the study of the effect of electronic scattering on superconductivity.
We explore the influence of these different parameters (electronic density, electronic interactions, electron-phonon coupling and electronic scattering) through the introduction of disorder or through the variation of charge carriers by chemical doping. Lately we studied granular aluminum, B-doped silicon and B-doped diamond. We employed transport measurements, optical spectroscopy and point contact spectroscopy.
Granular aluminum films are formed of superconducting nanometric grains of pure aluminum separated by oxide barriers. The coupling between grains can then be varied by changing the oxygen pressure during the Al evaporation, and this material can also be tuned from a superconductor to an insulator. Surprisingly, the critical temperature first rises (getting larger than in pure aluminium) before decreasing as the superconductor to insulator transition is approached, hence displaying a dome. By combining transport and state-to-the-art high resolution optical spectroscopy measurements, we have provided evidence for well resolved sub-gap absorptions, showing up in the vicinity of maximum of the superconducting dome. The nature of these excitations is still unclear but offers a unique opportunity to investigate the interplay between Josephson energy, Coulomb repulsion and superconducting coupling.
A detailed study of boron-doped diamond epilayers show that the boron concentration corresponding to the onset of superconductivity does not coincide with that of the metal-insulator transition.
Collaborations: Ioan Pop (KIT, Karlsruhe), Jozef Kacmarcik (Slovak Academy of Sciences), Shimpei Ono (CRIEPI, Tokyo).
Selected publications:
Electrodynamics of granular aluminum from superconductor to insulator: observation of collective superconducting modes, F. Levy-Bertrand, T. Klein, T. Grenet, O. Dupre, A. Benoît, A. Bideaud, O. Bourrion, M. Calvo, A. Catalano, A. Gomez, J. Goupy, L. Grunhaupt, U. v. Luepke, N. Maleeva, F. Valenti, I. M. Pop, and A. Monfardini, Physical Review B 99, 094506 (2019). [PRB, ArXiv]
Circuit Quantum Electrodynamics of Granular Aluminum Resonators, N. Maleeva, L. Grünhaupt, T. Klein, F. Levy-Bertrand, O. Dupré, M. Calvo, F. Valenti, P. Winkel, F. Friedrich, W. Wernsdorfer, A. V. Ustinov, H. Rotzinger, A. Monfardini, M. V. Fistul, and I. M. Pop, Nature Communications 9, 3889 (2018). [Nat. Com., ArXiv]
Phase diagram of B-doped diamond revisited by thickness-dependent magneto-transport, J.Bousquet, T.Klein, M.Solana, L.Saminadayar, C.Marcenat and E.Bustarret, Physical Review B, Rapid Communication 95, 161301(R) (2017). [PRB, HAL]
This research activity is focused on the unusual electronic states which exist when electrons are correlated. A variety of physical situations are investigated : electrons in low dimensional systems (Luttinger liquid in carbon nanotubes, electronic instabilities in quasi-1D or 2D crystals) ; peculiar charge, orbital and magnetic orders in 3D correlated systems (magnetite, multiferroics) ; electron Coulomb glass state in highly disordered systems.
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Associated staff: Thierry Grenet and Julien Delahaye.
During the past twenty years, a few experimental groups in the world have observed that in some disordered insulators and at low temperature, the application of a gate voltage or of other perturbations induce very slow (days long) relaxations of the electrical conductance. These were suggested to be the first experimental evidences of the “electron glass”. Glasses are systems with such a slow internal dynamics that they cannot reach their thermodynamic equilibrium within any experimentally accessible time. Famous examples in condensed matter are structural and spin glasses. It was theoretically suggested in the 80ies, that the electrons can “freeze” at low temperature in disordered insulators (Anderson insulators) due to the coexistence of disorder and ill-screened electron-electron interactions, giving rise to the so-called electron glass. We aim to characterize these slow relaxations and to understand their nature: do they really reflect the existence of a glassy state? Is this glass the electron glass or something else? Are the glassy features common to all disordered insulating systems?
To answer such questions, we first focused on the conductance relaxations of insulating granular Al films, an archetype of disordered insulators in which nanometric Al grains are embedded in an amorphous alumina matrix (see the left image on Fig. 1). We demonstrated that the slow dynamics observed at 4 K depends on the age of the system, i.e. the time elapsed since its cool down at low temperature (see Fig. 2) [Grenet et al, Eur. Phys. J. B 76 229 (2010)]. This property called “ageing” is characteristic of glassy systems and found for example in spin and structural glasses. We also developed non-isothermal gate voltage protocols that allowed us to reveal the non-trivial thermally activated character of the glassy dynamics [Grenet et al, Eur. Phys. J. B. 56 183 (2007); Grenet et al, J. Phys. Cond. Matt. 29 455602 (2017)].
We are currently exploring in a wide range of resistance and temperature (4 K – 300 K) other insulating systems of different disorder realizations: amorphous NbSi (in collaboration with Claire Marrache-Kikuchi’s group in Orsay), amorphous indium oxide films and discontinuous gold films (in collaboration with Aviad Frydman’s group in Tel Aviv). Our first results reveal that most of the glassy features, such as ageing and thermal activation of the dynamics, are robust and shared by all the systems [Delahaye et al, SciPost Phys. 8 056 (2020)].
Collaborations: Claire Marrache-Kikuchi’s group, CSNSM, Orsay ; Aviad Frydman’s group, Bar-Ilan University, Tel-Aviv ; Miguel Ortuño’s group, Murcia University, Murcia.
Selected publications:
Anomalous electric field and glassy behaviour in granular aluminium thin films: electron glass?, T. Grenet, J. Delahaye, M. Sabra and F. Gay, Eur. Phys. J. B 56, 183 (2007). [EPJB, arXiv]
Manifestation of ageing in the low temperature conductance of disordered insulators, T. Grenet and J. Delahaye, Eur. Phys. J. B 76, 229 (2010). [EPJB, arXiv]
Manifestation of ageing in the low temperature conductance of disordered insulators, T. Grenet and J. Delahaye, Eur. Phys. J. B 76, 229 (2010). [EPJB, arXiv]
Evidence for thermal activation in the glassy dynamics of insulating granular aluminium conductance, T. Grenet and J. Delahaye, Journal of Physics Condensed Matter 29, 455602 (2017). [JPCondMat, arXiv]
Electron glass effects in amorphous NbSi, J. Delahaye, T. Grenet, C. Marrache-Kikuchi, V. Humbert, L. Bergé and L. Dumoulin, SciPost Phys. 8 056 (2020). [SciPost, arXiv]
Associated staff: Thierry Grenet (MagSup), Julien Delahaye (MagSup) and Benjamin Sacépé (QuNES).
PhD Student: Thibault Charpentier (QuantECA).
The problem of localization of quantum particles by disorder is a long-standing one. It was pioneered by P. W. Anderson in 1958 who discovered that disorder can localize non-interacting degrees of freedom. However little progress was made concerning the effect of mutual interactions, like e.g. the coulomb repulsion between electrons in disordered solids.
Ten years ago a theoretical breakthrough was achieved. It was shown that a system of interacting fermions put in a static disordered potential, totally isolated from any external thermal bath, may experience a transition from an equilibrium metallic phase to a localized non ergodic one when the temperature is reduced below a critical Tc. The transition was coined many-body localization (MBL).
This prediction has far reaching implications. First it is a fundamental progress in the basic question about the conditions under which isolated quantum systems can thermalize without the help of any external bath, and comply with equilibrium statistical mechanics. It also predicts the existence of an unprecedented kind of insulator which possesses an exactly zero conductivity (in the infinite system limit) in a finite temperature interval T < Tc.
Although these findings sparked a tremendous theoretical activity, a clear experimental demonstration of MBL is still missing.
In this project we propose to search for this new phenomenon in Cooper-pair insulators. These are systems possessing Cooper pairs localized by disorder. A prototypical case is amorphous (a) indium oxide under magnetic field. In this system, it was shown that electrons are efficiently decoupled from phonons at low temperature. Moreover in the Cooper-pair insulator phase, the resistance shows a divergence at finite temperature, an expected hallmark of MBL.
These first results are very promising and much broader investigations are now needed to more surely identify and study the aspects of the MBL. With our project partners, we propose to investigate the different aspects of the transition using dielectric (Institut Néel) and thermoelectric measurements (LPEM), as well as to search for the non-ergodic features expected to appear near and across Tc (Institut Néel). These studies will be complemented by the characterization and measurements of a second promising candidate material: insulating a-YSi (CSNSM). These investigations will be conducted in close interaction with theoretical analyses (LPTHE).
Project partners: Lev Ioffe and Lara Faoro (LPTHE, Orsay) ; Claire Marrache-Kikuchi, Shamashis Sengupta, Louis Dumoulin, Laurent Bergé and Marnieros Stefanos (CSNSM, Orsay) ; Kamran Behnia and Benoit Fauqué (LPEM, Paris).
Funding: ANR (2019-2023).
Beyond simple collinear ferromagnets and antiferromagnets, a wealth of remarkable properties is observed in bulk magnetic materials like oxides, molecular magnets or intermetallics, containing rare-earth and/or transition metals atoms. The ingredients favoring complexity and hence interesting behaviors are (i) the magnetic frustration either arising from competing interactions or from the geometry of the lattice based for instance on triangles (kagome), on tetrahedra (pyrochlore), or on pentagons, (ii) the presence of several degrees of freedom like spin, orbit, lattice or charge, (iii) the low dimensionality of the magnetic lattice.
Associated staff: R. Ballou, S. de Brion, E. Lhotel, E. Lorenzo, C. Paulsen, J. Robert, V. Simonet.
Former non-permanent staff: E. Lefrançois, Q. Faure, E. Constable.
The reduction of dimensionality in bulk magnetism is due to the existence of a hierarchy of interactions, i.e. the magnetic coupling is much stronger in one or two spatial directions than in the remaining ones. This can lead to 2D, 1D (spin chains) or even 0D (single molecule magnets) magnetic arrangements, which are model systems for studying cooperative magnetic phenomena in presence or absence of long-range magnetic ordering. In particular, additional ingredients such as magnetic frustration, strong spin-orbit coupling, or quantum effects induce exotic ground states (e.g. spin liquid state) dressed with excitations that may have no counterpart in conventional 3D magnets (e.g. spinons) with specific defects (0D or 1D domain-walls) and topological properties.
Experimentally, the systems we are interested in are oxide compounds, but also molecular magnets in which the magnetic topology can be designed thanks to the versatile arrangement of molecular building blocks. We study their magnetic properties using specific instrumentation down to very low temperatures (< 100 mK magnetometry and specific heat) as well as large-scale facilities (neutron scattering and synchrotron X-ray). This allows us to probe precisely their unconventional phase diagram and the associated excitations, as a function of magnetic field, pressure and temperature.
As example, we have evidenced long-distance spin entanglement in the spin ladder/spin chain cuprate Sr14Cu24O41. We have also unveiled novel magnetic field-induced (topological) quantum phase transitions in the spin chain compound BaCo2V2O8.
Some collaborations: T. Giamarchi (Univ. Geneva, Switzerland), S. Takayosi (Konan University, Kobe, Japan), S. Petit (LLB), B. Grenier, C. Marin, S. Raymond, L.P. Regnault (INAC CEA Grenoble), L. Chapon (Diamond, UK), M. Moretti (Politecnico di Milano), A. Revcolevschi (Orsay), S. Sahling (TU Dresden), R. Sibille (PSI, Switzerland), J.-P. Sutter (LCC, Toulouse), ….
Publications:
The high field magnetisation of FePS3, A. R. Wildes, D. Lançon, M. K. Chan, F. Weikert, N. Harrison, V. Simonet, M. Zhitomirsky, M. Gvodikova, T. Ziman and H. Rønnow, Physical Review B 101, 024415 (2020). [PRB]
Tomonaga-Luttinger Liquid Spin Dynamics in the Quasi-One-Dimensional Ising-Like Antiferromagnet BaCo2V2O8, Q. Faure, S. Takayoshi, V. Simonet, B. Grenier, M. Månsson, J. White, G. Tucker, C. Rüegg, P. Lejay, T. Giamarchi and S. Petit, Physical Review Letters, 123, 027204 (2019). [arXiv, PRL]
Low-Temperature Heat Capacity of Sr2Ca12Cu24O41, S. Sahling, J. E. Lorenzo, G. Remenyi and V. L. Katkov, J Low Temp Phys, 194, 142 (2018). [JLowTempPhys]
Polarized-neutron investigation of magnetic ordering and spin dynamics in BaCo2(AsO4)2 frustrated honeycomb-lattice magnet, L.P. Regnault, C. Boullier and J.E. Lorenzo, Heliyon 4, e00507 (2018). [arXiv, Heliyon]
Generalized Ramsey interferometry explored with a single nuclear spin qudit, C. Godfrin, R. Ballou, E. Bonet, M. Ruben, S. Klyatskaya, W. Wernsdorfer and F. Balestro, npj Quantum Information 4, 53 (2018). [npj]
Topological quantum phase transition in the Ising-like antiferromagnetic spin chain BaCo2V2O8, Q. Faure, S. Takayoshi, S. Petit, V. Simonet, S. Raymond, L.-P. Regnault, M. Boehm, J. S. White, M. Månsson, Ch. Rüegg, P. Lejay, B. Canals, T. Lorenz, S. C. Furuya, T. Giamarchi and B. Grenier, Nature Physics, 14, 716 (2018). [arXiv, NatPhys]
The magnetic properties and structure of the quasi-two-dimensional antiferromagnet CoPS3, A. R. Wildes, V. Simonet, E. Ressouche, R. Ballou and G. J. McIntyre, J. Phys. : Condens. Matter 29, 455801 (2017). [arXiv, JPhysCondMatt]
Operating Quantum States in Single Magnetic Molecules: Implementation of Grover’s Quantum Algorithm,
C. Godfrin, A. Ferhat, R. Ballou, S. Klyatskaya, M. Ruben, W. Wernsdorfer and F. Balestro, Phys. Rev. Lett. 119, 187702 (2017). [PRL]
Magnetic properties of the honeycomb oxyde Na2Co2TeO6, E. Lefrançois, M. Songvilay, J. Robert, G. Nataf, E. Jordan, L. Chaix, R. Ballou, C. V. Colin, P. Lejay, A. Hadj-Azzem and V. Simonet, Physical Review B 94, 214416 (2016). [PRB]
Anisotropic interactions opposing magnetocrystalline anisotropy in Sr3NiIrO6, E. Lefrançois, A.-M. Pradipto, M. Moretti Sala, L. C. Chapon, V. Simonet, S. Picozzi, P. Lejay, S. Petit and R. Ballou, Physical Review B 93, 224401 (2016). [arXiv, PRB]
The magnetic structure of the quasi-two dimensional antiferromagnet NiPS3, A. R. Wildes, V. Simonet, E. Ressouche, G. McIntyre, M. Avdeev, E. Suard, S. Kimber, D. Lançon, G. Pepe, B. Moubaraki and T. J. Hicks, Physical Review B, 92, 224408 (2015). [HAL, PRB]
Neutron diffraction investigation of the H−T phase diagram above the longitudinal incommensurate phase of BaCo2V2O8, B. Grenier, V. Simonet, B. Canals, P. Lejay, M. Klanjsek, M. Horvatik and C. Berthier, Physical Review B, 92, 134416 (2015). [HAL, PRB]
Experimental realization of long-distance entanglement between spins in antiferromagnetic quantum spin chains, S. Sahling, G. Remenyi, C. Paulsen, P. Monceau, V. Saligrama, C. Marin, A. Revcolevschi, L. P. Regnault, S. Raymond and J. E. Lorenzo, Nature Physics 11, 255 (2015). [Nature Phys.]
Longitudinal and transverse Zeeman ladders in the Ising-like chain antiferromagnet BaCo2V2O8, B. Grenier, S. Petit, V. Simonet, L.-P. Regnault, E. Canévet, S. Raymond, B. Canals, C. Berthier and P. Lejay, Physical Review Letters, 114, 017201 (2015). [arXiv, PRL]
On the importance of ferromagnetic exchange between transition metals in field-free SMMs : examples of ring-shaped hetero-trimetallic [(LnNi2)W(CN)8]2 compounds , S. Dhers, J.P. Costes, P. Guionneau, C. Paulsen, L. Vendier and J.-P. Sutter, Chem. Commun. 51, 7875 (2015). [Chem. Comm.]
Magnetic order in the frustrated Ising-like chain compound Sr3NiIrO6, E. Lefrançois, L. C. Chapon, V. Simonet, P. Lejay, D. Khalyavin, S. Rayaprol, E. V. Sampathkumaran, R. Ballou and D. T. Adroja, Physical Review B, 90, 014408 (2014). [arXiv, PRB]
Electrically driven nuclear spin resonance in single-molecule magnets, S. Thiele, F. Balestro, R. Ballou, S. Klyatskaya, M. Ruben and W. Wernsdorfer, Science 344, 1135 (2014). [Science]
Adding Remnant Magnetization and Anisotropic Exchange to Propeller-like Single-Molecule Magnets through Chemical Design, K.C.M. Westrup, M.E. Boulon , P. Totaro, G.G. Nunes, D.F. Back, A. Barison, M. Jackson, C. Paulsen, D. Gatteschi, L. Sorace, A. Cornia, J.F. Soares and R. Sessoli, Chemistry – A European Journal 20, 13681 (2014). [Chem. A Eur. J.]
[Mn-III(Schiff Base)]3[Re-IV(CN)7], Highly Anisotropic 3D Coordination Framework : Synthesis, Crystal Structure, Magnetic Investigations, and Theoretical Analysis, D.G. Samsonenko, C. Paulsen, E. Lhotel, V.S. Mironov and K.E. Vostrikova, Inorg. Chem. 53, 10217 (2014). [Inorg. Chem.]
Magnetic structure and dynamics of a strongly one-dimensional cobalt(II) metal-organic framework, R. Sibille, E. Lhotel, T. Mazet, B. Malaman, C. Ritter, V. Ban and M. François, Physical Review B 89, 104413 (2014). [arXiv, PRB]
Cette page est vide.
Associated staff: R. Ballou, S. de Brion, E. Lhotel, C. Paulsen, J. Robert, V. Simonet, M. Songvilay
Non permanent staff: Y. Alexanian, M. Léger, F. Museur
Magnetic structure and excitations in Fe langasite
The guiding principle of our research is the quest for new magnetic phases of matter. In this respect, magnetic frustration, stemming either from the geometry of the lattice, or from competition between different kinds of magnetic interactions, may lead to very wide range of exotic phenomena and magnetic states, that can be ordered (ex. non-collinear, chiral) or disordered (ex. spin liquids, spin ices, where the competing interactions prevents the system from conventional magnetic ordering).
Understanding, characterizing and classifying this novel states of matter, having non-trivial static and dynamical correlations, is one of the main goal of the current research in frustrated systems : degeneracy of the ground-state ? stability against quantum fluctuations ? broken symmetry and underlying order parameter (nematic order, topological order, etc.) ? elementary excitations (local soft modes, fractional bosonic excitations such as spinons and “magnetic monopoles”, etc.) ? Role of the competition/cooperation between several degrees of freedom (spin, orbit, lattice, charge) ?
Experimentally, answering these questions requires a combination of complementary probes developed at the Institut Néel or based on large scale facilities : magnetometry, neutron and X-ray scattering under extreme conditions (very low temperatures, high magnetic fields). Using these techniques, we mainly focus our attention on classical and quantum properties of lattices based on corner-sharing triangles or tetraedra or other geometries (pentagons). The experimental results are confronted to models in a fructuous comings and goings through collaborations with theoreticians. This activity is also based on the use of high quality materials, in particular single-crystals, and therefore relies on a synthesis work realized inside or outside the laboratory.
Some collaborations:
Institut Néel : MRS and TMC teams
Others : E. Ressouche, S. Raymond, M. Zhitomirsky (INAC CEA Grenoble), S. Petit, F. Damay (LLB), S. Giblin (Cardiff University, UK), K. Matsuhira (Kyushu, Japan), R. Sibille (PSI, Switzerland), P. Holdsworth (ENS Lyon), L. C. Chapon (Diamond), P.P. Deen (ESS, Sweden), M. Ciomaga Hatnean, G. Balakrishnan (Univ. Warwick)
Some recent publications
Dimer physics in the frustrated Cairo pentagonal antiferromagnet Bi2Fe4O9
K. Beauvois, V. Simonet, S. Petit, J. Robert, F. Bourdarot, M. Gospodinov, A. A. Mukhin, R. Ballou, V. Skumryev, E. Ressouche, Phys. Rev. Lett. 124, 127202 (2020). [Phys. Rev. Lett., arXiv]
A quantum liquid of magnetic octupoles on the pyrochlore lattice
R. Sibille, N. Gauthier, E. Lhotel, V. Porée, V. Pomjakushin, R. A. Ewings, T. G. Perring, J. Ollivier, A. Wildes, C. Ritter, T. C. Hansen, D. A. Keen, G.J. Nilsen, L. Keller, S. Petit and T. Fennell. Nature Phys. 16, 546 (2020). [Nat. Phys, arXiv]
Nuclear spin assisted quantum tunnelling of magnetic monopoles in spin ice
C. Paulsen, S. Giblin, E. Lhotel, D. Prabhakaran, K. Matsuhira, G. Balakrishnan, and S. Bramwell. Nature Commun. 10, 1509 (2019). [Nat. Comm., arXiv]
Spin decoupling under a staggered field in the Gd2 Ir2O7 pyrochlore
E. Lefrançois, L. Mangin-Thro, E. Lhotel, J. Robert, S. Petit, V. Cathelin, H. E. Fischer, C. V. Colin, F. Damay, J. Ollivier, P. Lejay, L. C. Chapon, V. Simonet, and R. Ballou. Phys. Rev. B 99, 060401(R) (2019). [Phys. Rev. B, arXiv]
Evidence for dynamic kagome ice
E. Lhotel, S. Petit, M. Ciomaga Hatnean, J. Ollivier, H Mutka, E Ressouche, M. R. Lees, and G. Balakrishnan. Nature Commun. 9, 3786 (2018). [Nat. Comm., arXiv]
Double vibronic process in the quantum spin ice candidate Tb2Ti2O7 revealed by terahertz spectroscopy
E. Constable, R. Ballou, J. Robert, C. Decorse, J.-B. Brubach, P. Roy, E. Lhotel, L. Del-Rey, V. Simonet, S. Petit, and S. de Brion, Phys. Rev. B 95, 020415(R) (2017). [Phys. Rev. B, ArXiv]
Fragmentation in spin ice from magnetic charge injection
E. Lefrançois, V. Cathelin, E. Lhotel, J. Robert, P. Lejay, C. V. Colin, B. Canals, F. Damay, J. Ollivier, B. Fåk, L. Chapon, R. Ballou, and V. Simonet. Nature Commun. 8, 209 (2017). [Nat. Comm., arXiv]
Magnetic and dielectric order in the kagome-like francisite Cu3Bi(SeO3)2O2Cl
E. Constable, S. Raymond, S. Petit, E. Ressouche, F. Bourdarot, J. Debray, M. Josse, O. Fabelo, H. Berger, S. de Brion, V. Simonet, Phys. Rev. B 96, 014413 (2017). [Phys. Rev. B, arXiv]
Associated staff: M. Amara, R. Ballou, S. de Brion, J. Robert, V. Simonet.
Present non permanent staff: Y. Alexanian.
Former non-permanent staff: M. Loire, L. Chaix (PhD), E. Constable (Post-doc), C. Eggenspiller, J. Scoarnec (Master).
The combination of several ferroic orders (ferroelectric, ferromagnetic, ferroelastic, ferrotoroidic and their antiferro- couterparts) in the same material, coined under the term of multiferroics, has received a lot of attention for more than one decade. Multiferroics indeed open the way to the electric-field control of magnetic dipoles and the converse magnetic-field control of electric dipoles in a number of future hybrid technologies (for instance novel electronics based on spins and charges). This electric/magnetic cross-manipulation, based on the magnetoelectric effect, can be at play at the static level allowing the electric/magnetic manipulation of magnetic/ferroelectric/ferrotoroidic domains for instance. It can also have signatures on the elementary excitations emerging from the ordered states of matter in the form of hybrid excitations called electromagnon that are now perceived as an electric charge dressing of magnons. This dressing enables the electric-field control of magnons and is thus foreseen to be used in magnonics, a new information science using magnetic excitations to carry and process information. In this context, the search for other new kinds of magnetoelectric excitations and of new mechanisms enabling the electroactivity of magnons is a key issue.
In our team, we search for novel multiferroic materials and novel properties associated to the coupling between various orders. We also study the magnetoelectric coupling at the dynamical level by combining sophisticated techniques implying the use of large-scale facilities such as inelastic neutron scattering and THz spectroscopy on a synchrotron source.
Tools
At Néel Institute:
Large scale facilities:
Main collaborations
Links:
Highlight 2015: TeraHertz properties of multiferroic compounds
Highlight 2013: TeraHertz magneto-electric excitations in a chiral material
Publications:
Incommensurate spin ordering and excitations in multiferroic SrMnGe2O6, C. V. Colin, L. Ding, E. Ressouche, J. Robert, N. Terada, F. Gay, P. Lejay, V. Simonet, C. Darie, P. Bordet and S. Petit, Phys. Rev. B 101, 235109 (2020). [PRB]
Archetypal soft-mode driven antipolar transition in francisite Cu3Bi(SeO3)2O2Cl, C. Milesi-Brault, C. Toulouse, E. Constable, H. Aramberri, V. Simonet, S. de Brion, H. Berger, L. Paolini, A. Bosak, J. Iñiguez and M. Guennou, Phys. Rev. Lett. 124, 097603 (2020). [PRL, ArXiv]
Effects of Ca substitution on quasi-acoustic sliding modes in Sr14-xCaxCu24O41, E. Constable, A.D. Squires, J. Horvat, R.A. Lewis, D. Appadoo, R. Plathe, P. Roy, J.-B. Brubach, S. deBrion, A. Pimenov and G. Deng, Phys. Rev. B 100, 1843005 (2019). [PRB, Arxiv]
Interplay between spin dynamics and crystal field in the multiferroic compound HoMnO3, X. Fabrèges, S. Petit, J.-B. Brubach, P. Roy, M. Deutsch, A. Ivanov, L. Pinsard-Gaudart, V. Simonet, R. Ballou and S. de Brion, Phys. Rev. B 100, 094437 (2019). [PRB, ArXiv]
Field-induced double spin spiral in a frustrated chiral magnet, M. Ramakrishnan, E. Constable, A. Cano, M. Mostovoy, J. S. White, N. Gurung, E. Schierle, S. de Brion, C. V. Colin, F. Gay, P. Lejay, E. Ressouche, E. Weschke, V. Scagnoli, R. Ballou, V. Simonet and U. Staub, Nature Physical Journal, Quantum Materials 4, 60 (2019). [NaturePhysQM, ArXiv]
Single-crystal neutron diffraction study of hexagonal YbMnO3 under magnetic field, S. Chattopadhyay, V. Simonet, V. Skumryev, A.A. Muhkin, V. Ivanov, D.Z. Dimitrov, M. Gospodinov and E. Ressouche, Phys. Rev. B 98, 134413 (2018). [PRB, arXiv]
Microscopic Insights on the Multiferroic Perovskite‐Like [CH3NH3][Co(COOH)3] Compound, L. Mazzuca, L. Cañadillas‐Delgado, O. Fabelo, J.A. Rodríguez‐Velamazán, J. Luzón, O. Vallcorba, V. Simonet, C.V. Colin and J. Rodríguez‐Carvajal, Chemistry – A European Journal 24, 388 (2018). [ChemEurJ]
Field driven magnetostructural transitions in GeCo2O4, X. Fabrèges, E. Ressouche, F. Duc, S. de Brion, M. Amara, C. Detlefs, L. Paolasini, E. Suard, L.-P. Regnault, B. Canals, P. Strobel and V. Simonet, Phys. Rev. B 95, 014428 (2017). [PRB]
Magnetic and dielectric order in the kagomelike francisite Cu3Bi(SeO3)2O2Cl, E. Constable, S. Raymond, S. Petit, E. Ressouche, F. Bourdarot, J. Debray, M. Josse, O. Fabelo, H. Berger, S. deBrion and V. Simonet, Phys. Rev. B 96, 014413 (2017). [PRB, ArXiv]
Experimental evidences of symmetry breaking in the multiferroic Ba3NbFe3Si2O14 using sound velocity measurements, G. Quirion, C. Bidaud, J. Quilliam, P. Lejay, V. Simonet and R. Ballou, Phys. Rev. B 96, 134433 (2017). [PRB]
Crystal Symmetry Lowering in Chiral Multiferroic Ba3TaFe3Si2O14 observed by X-Ray Magnetic Scattering, M. Ramakrishnan, Y. Joly, Y. W. Windsor, L. Rettig, A. Alberca, E. M. Bothschafter, R. Ballou, V. Simonet, P. Lejay, V. Scagnoli and U. Staub, Phys. Rev. B 95, 205145 (2017). [PRB, HAL]
Phase diagram of multiferroic KCu3As2O7(OD)3, J. Nilsen, V. Simonet, C.V. Colin, R. Okuma, Y. Okamoto, M. Tokunaga,T.C. Hansen, D.D. Khalyavin and Z. Hiroi , Phys. Rev. B 95, 214415 (2017). [PRB, ArXiv]
One-dimensional short-range magnetic correlations in the magnetoelectric pyroxene CaMnGe2O6, L. Ding, C.V. Colin, C. Darie, J. Robert, F. Gay and P. Bordet, Phys. Rev. B 93, 064423 (2016). [PRB]
Helical bunching and symmetry lowering inducing multiferroicity in Fe langasites, L. Chaix, R. Ballou, A. Cano, S. Petit, S. de Brion, J. Ollivier, L.-P. Regnault, E. Ressouche, E. Constable, C.V. Colin, A. Zorko, V. Scagnoli, J. Balay, P. Lejay and V. Simonet, Phys. Rev. B 93, 214419 (2016). [PRB]
Phonons in the multiferroic langasite Ba3NbFe3Si2O14: Evidence for symmetry breaking, C. Toulouse, M. Cazayous, S. de Brion, F. Levy-Bertrand, H. Barkaoui, P. Lejay, L. Chaix, M.B. Lepetit, J.B. Brubach and P. Roy, Phys. Rev. B 92, 104302 (2015). [PRB]
Magneto- to electro-active transmutation of spin waves in ErMnO3, L. Chaix, S. de Brion, S. Petit, R. Ballou, L.-P. Regnault, J. Ollivier, J.-B. Brubach, P. Roy, J. Debray, P. Lejay, A. Cano, E. Ressouche and V. Simonet, Phys . Rev. Lett. 112, 137201 (2014). [PRL]
Lattice and spin excitations in multiferroic h-YMnO3, C. Toulouse, J. Liu, Y. Gallais, M.-A. Measson, A. Sacuto, M. Cazayous, L. Chaix, V. Simonet, S. de Brion, L. Pinsard-Godart, F. Willaert, J.B. Brubach, P. Roy and S. Petit, Phys. Rev. B 89, 094415 (2014). [PRB]
Helical order and multiferroicity in the S = 1/2 quasi-kagome system KCu3As2O7(OD)3, J. Nilsen, Y. Okamoto, H. Ishikawa, V. Simonet, C. Colin, L.C. Chapon, T. Hansen, H. Mutka and Z. Hiroi, Phys. Rev. B 89, 140412 (2014). [PRB, ArXiv]
THz Magneto-electric atomic rotations in the chiral compound Ba3NbFe3Si2O14, L. Chaix, S. de Brion ,F. Levy-Bertrand, V. Simonet, R. Ballou, B. Canals, P. Lejay, J.B. Brubach, G. Creff, F. Willaert, P. Roy and A. Cano, Phys . Rev. Lett. 110, 157208 (2013). [PRL]
The Role of Order-disorder Transitions in the Quest for Molecular Multiferroics : Structural and Magnetic Neutron Studies of a Mixed Valence Iron(II)-Iron(III) Formate Framework, L. Cañadillas-Delgado, O. Fabelo, J. A. Rodríguez-Velamazán, M.-H. Lemée-Cailleau, S.A. Mason, E. Pardo, F. Lloret, J.-P. Zhao, X.-H. Bu, V. Simonet, C. V. Colin and J. Rodríguez-Carvajal, J. Am. Chem. Soc., 134, 19772–19781 (2012). [JACS, HAL]
Magnetoelectric MnPS3 as a candidate for ferrotoroidicity, E. Ressouche, M. Loire, V. Simonet, R. Ballou, A. Stunault and A. Wildes, Phys. Rev. B 82, 100408(R), Editor’s suggestion (2010). [PRB, ArXiv]
Magnetic and dielectric properties in the langasite-type compounds : A3BFe3D2O14 with A=Ba, Ca, Sr, B=Nb, Ta, Sb, and C=Si, Ge, K. Marty, P. Bordet, V. Simonet, M. Loire, R. Ballou, C. Darie, J. Kljun, P. Bonville, O. Isnard, P. Lejay, B. Zawilski and C. Simon, Phys. Rev. B 81, 054416 (2010). [PRB, ArXiv]
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Cette page est vide.
Synthèse de cristaux C. Opagiste, En collaboration avec le Pôle Cristaux Massifs – PLUM
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Whisker de Lu5Ir4Si10
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Grands instruments Rayonnement synchrotron, M. Amara, M. d’Astuto, R. Ballou, S. de Brion, R.-M. Galera, F. Levy-Bertrand, J. E. Lorenzo, P. Rodière, V. Simonet Diffusion de neutrons, M. Amara, M. d’Astuto, R. Ballou, S. de Brion, R.-M. Galera, E. Lhotel, J. E. Lorenzo, C. Opagiste, J. Robert, P. Rodière, V. Simonet, J.L. Soubeyroux
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Image du site de l’ILL et de l’ESRF |
Instrumentation de pointe Sondes locales, H. Cercellier, K. Hasselbach, T. KleinMicroscopie à microSQUID Magnétométrie à très basse température, C. Paulsen, E. LhotelSusceptibilité magnétique alternative à SQUID: 60 mK, 0.1 mHz à 1 kHz |
Appareil de mesure de longueur de pénétration |
Avec 7 maîtres de conférences et professeurs et 2 chercheurs CNRS avec une délégation partielle d’enseignement, notre équipe est fortement impliquée dans les cours et la formation des étudiants. Nous avons des responsabilités pédagogiques dans les parcours et les unités d’enseignement de l’école d’ingénieurs Grenoble-INP et de l’Université Grenoble Alpes. Nous donnons également des cours dans des écoles thématiques européennes (par exemple : European School of Magnetism, European School of Applied Superconductivity, Hercules, DRTBT, ISOE) et dans les formations continues en cryogénie organisées par le CNRS.
With seven professors and associate professors and two CNRS researchers with a partial delegation of teaching, the team is strongly involved in lectures and training of students. We have pedagogical responsibilities at the engineering school of Grenoble INP and at Grenoble Alpes University (UGA). We also give lectures in European or thematic schools (including European School of Magnetism, European School of Applied Superconductivity, Hercules, DRTBT, ISOE) and in continuous training in cryogenic organized by the CNRS.
Activités d’enseignement des membres de l’équipe :
Responsable : Thierry Klein.
Grenoble est incontestablement un des principaux pôles mondiaux de recherche en physique de la matière condensée. C’est pourquoi l’Université Grenoble-Alpes propose depuis plusieurs décennies un parcours dédié à l’apprentissage de la physique de la matière condensée. Ce parcours baptisé « Matière Quantique » permet d’acquérir l’ensemble des outils conceptuels, expérimentaux et/ou numériques qui permettront de mieux comprendre les propriétés quantiques de la matière. Il est l’un des trois parcours de recherche fondamentale (RF) du master de Physique de l’UGA.
Liens :
A titre d’exemple, vous trouverez ci-dessous les présentations détaillées d’un certain nombre de cours donnés au sein de la mention physique par les enseignants de l’équipe :
Position type: Master 2 internships and theses
Contact: Songvilay Manila - 0438781462
L’objectif de ce stage est l’étude de propriétés magnétiques dans des nouveaux composés au cobalt, présentant une forte compétition entre interactions. D’une part, cette compétition entre interactions peut amener à des états de spin complexes. D’autre part, le cobalt Co2+ est un élément intéressant car son couplage spin-orbite significatif le rend sensible aux modifications de son environnement. Il s’agira donc d’étudier l’évolution de ses propriétés magnétiques en jouant sur les paramètres structuraux des composés envisagés.
Position type: Master 2 internships and theses
Contact: D'ASTUTO Matteo - 04 76 88 12 22 | BENHABIB Siham - 01 69 15 53 95
High-Tc superconductivity in cuprates is one of the most challenging topics in modern physics. Despite extensive research, their underlying mechanisms remain poorly understood. These quantum materials not only demonstrate high critical temperatures at ambient pressure but also feature some of the most complex phase diagrams. In this context, the discovery of Na- and vacancy-doped Ca2CuO2Cl2 oxychloride is highly promising to bridge the gap between theory and experiment. In this project, we aim to examine how the electronic structure evolves across different phases, including superconductivity, the pseudogap, and the strange metal phase using ultra-fast time/Angle-Resolved Photoemission Spectroscopy (trARPES).
Person in charge: Florence LEVY-BERTRAND, Mattéo DASTUTO
Permanents
Students & Post-docs & CDD
Mehdi AMARA
Personnel Chercheur - UGA
mehdi.amara [at] neel.cnrs.fr
Phone: 04 76 88 79 13
Office: K-208
Rafik BALLOU
Personnel Chercheur - CNRS
rafik.ballou [at] neel.cnrs.fr
Herve CERCELLIER
Personnel Chercheur - UGA
herve.cercellier [at] neel.cnrs.fr
Phone: 04 76 88 10 80
Office: E-421
Mattéo DASTUTO
Personnel Chercheur - CNRS
matteo.dastuto [at] neel.cnrs.fr
Phone: 04 76 88 12 22
Office: E-413
Sophie DEBRION
Personnel Chercheur - UGA
sophie.debrion [at] neel.cnrs.fr
Phone: 04 76 88 79 12
Office: K-210
Julien DELAHAYE
Personnel Chercheur - CNRS
Julien.Delahaye [at] neel.cnrs.fr
Phone: 04 76 88 74 92
Office: D-404
Thierry GRENET
Personnel Chercheur - CNRS
Thierry.Grenet [at] neel.cnrs.fr
Phone: 04 76 88 74 61
Office: D-414
Klaus HASSELBACH
Personnel Chercheur - CNRS
Klaus.Hasselbach [at] neel.cnrs.fr
Phone: 04 76 88 11 54
Office: E-416
El-Kebir HLIL
Personnel Chercheur - UGA
El-Kebir.Hlil [at] neel.cnrs.fr
Phone: 04 76 88 11 41
Office: F-204
Thierry KLEIN
Personnel Chercheur - UGA
Thierry.Klein [at] neel.cnrs.fr
Phone: 04 76 88 90 64
Office: E-418
Florence LEVY-BERTRAND
Personnel Chercheur - CNRS
florence.levy-bertrand [at] neel.cnrs.fr
Phone: 04 76 88 12 14
Office: E-421
Elsa LHOTEL
Personnel Chercheur - CNRS
elsa.lhotel [at] neel.cnrs.fr
Phone: 04 76 88 12 63
Office: E-113
José-Emilio LORENZO-DIAZ
Personnel Chercheur - CNRS
Jose-Emilio.Lorenzo-Diaz [at] neel.cnrs.fr
Phone: 04 76 88 12 84
Office: E-316
Marie-Aude MEASSON
Personnel Chercheur - CNRS
marie-aude.measson [at] neel.cnrs.fr
Phone: 04 76 88 90 67
Office: E-314
Pierre MONCEAU
Personnel Chercheur - CNRS
Pierre.Monceau [at] neel.cnrs.fr
Phone: 04 76 88 11 59
Office: E-315
Manuel NUNEZ-REGUEIRO
Personnel Chercheur - CNRS
Manolo.Nunez-Regueiro [at] neel.cnrs.fr
Phone: 04 76 88 78 38
Office: E-311
Christine OPAGISTE
Personnel Chercheur - UGA
Christine.Opagiste [at] neel.cnrs.fr
Phone: 04 76 88 90 91
Office: E-419
Carley PAULSEN
Personnel Chercheur - CNRS
Carley.Paulsen [at] neel.cnrs.fr
Phone: 04 76 88 90 66
Office: E-416
Julien ROBERT
Personnel Chercheur - CNRS
Julien.Robert [at] neel.cnrs.fr
Phone: 04 76 88 79 13
Office: K-208
Pierre RODIERE
Personnel Chercheur - CNRS
Pierre.Rodiere [at] neel.cnrs.fr
Phone: 04 76 88 10 26
Office: E-420
Virginie SIMONET
Personnel Chercheur - CNRS
Virginie.Simonet [at] neel.cnrs.fr
Phone: 04 76 88 90 50
Office: E-408
Manila SONGVILAY
Personnel Chercheur - CNRS
manila.songvilay [at] neel.cnrs.fr
Phone: 04 38 78 14 62
Office: K-204
Pascal TIXADOR
Personnel Chercheur - G-INP
Pascal.Tixador [at] neel.cnrs.fr
Phone: 04 76 88 79 49
Office: E-411
Midori AMANO-PATINO
Personnel Chercheur - UGA
midori.amano-patino [at] neel.cnrs.fr
Phone: 04 76 88 12 86
Office: E-308
Referent: Klaus HASSELBACH
Antoine BARON
Personnel Chercheur - CNRS
antoine.baron [at] neel.cnrs.fr
Phone: 04 76 88 78 44
Office: E-317
Referent: Marie-Aude MEASSON
Nathan BUJAULT
Personnel Chercheur - UGA
nathan.bujault [at] neel.cnrs.fr
Office: E-306
Referent: Elsa LHOTEL
Jérémie CICERON
Personnel Chercheur - CNRS
jeremie.ciceron [at] neel.cnrs.fr
Phone: 04 76 88 90 39
Office: V-102
Referent: Arnaud BADEL
Armand DEVILLEZ
Personnel Chercheur - CNRS
armand.devillez [at] neel.cnrs.fr
Phone: 04 76 88 79 14
Office: K-207
Referent: Manila SONGVILAY
Yingzheng GAO
Personnel Chercheur - CNRS
yingzheng.gao [at] neel.cnrs.fr
Phone: 04 76 88 74 53
Office: E-313
Referent: Marie-Aude MEASSON
Gabriele GAROFALO
Personnel Chercheur - UGA
gabriele.garofalo [at] neel.cnrs.fr
Phone: 04 56 38 70 86
Office: E-309
Referent: Marie-Aude MEASSON
Felix MORINEAU
Personnel Chercheur - UGA
felix.morineau [at] neel.cnrs.fr
Phone: 04 76 88 74 53
Office: E-313
Referent: Elsa LHOTEL
Denis MOTTE MICHELLON
Personnel Chercheur - G-INP
denis.motte-michellon [at] neel.cnrs.fr
Referent: Pascal TIXADOR
Owen MOULDING
Personnel Chercheur - CNRS
owen.moulding [at] neel.cnrs.fr
Phone: 04 76 88 78 18
Office: E-312
Referent: Marie-Aude MEASSON
Jérémy SARRADE
Personnel Chercheur - UGA
jeremy.sarrade [at] neel.cnrs.fr
Office: E-317
Referent: Thierry KLEIN
Mathilde SCHUCHARD
Personnel Chercheur - CNRS
mathilde.schuchard [at] neel.cnrs.fr
Phone: 04 76 88 78 44
Office: E-317
Referent: Thierry KLEIN
Hugo SOURICE
Personnel Chercheur - G-INP
hugo.sourice [at] neel.cnrs.fr
Phone: 04 56 38 71 98
Office: V-102
Referent: Hugo SOURICE
Alexander STANGL
Personnel Chercheur - CNRS
alexander.stangl [at] neel.cnrs.fr
Referent: Arnaud BADEL
Arthur TALARMIN
Personnel Chercheur - CNRS
arthur.talarmin [at] neel.cnrs.fr
Phone: 04 56 38 71 80
Office: D-413
Referent: Rafik BALLOU
Imane ABDELRHAFOR
Personnel Chercheur - CNRS
imane.abdelrhafor [at] neel.cnrs.fr
Phone: 04 76 88 11 41
Office: F-204
Referent: El-Kebir HLIL
Elisa AUFFRAY
Personnel Chercheur - CNRS
elisa.auffray [at] neel.cnrs.fr
Referent: Marie-Aude MEASSON
Arnaud BADEL
Personnel Chercheur - CNRS
arnaud.badel [at] neel.cnrs.fr
Phone: 04 76 88 90 39
Office: V-102
Christophe MARCENAT
Personnel Chercheur - CEA/INAC
christophe.marcenat [at] neel.cnrs.fr
Phone: 04 76 88 12 01
Office: E-418
Referent: Pierre RODIERE