klaus.hasselbach:Main - Institut Neel

Main

Our aim is to contribute to the better understanding of unconventional superconductors. Their superconductivity can present particular magnetic fingerprints informing us about the underlying mechanisms responsible for their properties . We have developed and run a scanning SQUID microscope in a dilution refrigerator to probe the magnetic signatures of these quantum phenomena.

We undertake this research in close collaboration with colleagues from our team, and other collaborators at NEEL, CEA Grenoble, Tohoku University, Amsterdam University…

The SQUID microscope is part of the European Mikrokelvin Platform.

Unconventional Superconductors by scanning SQUID microscopy

collaborations:

J.R. Kirtley, C. Paulsen, D. Aoki, A. de Visser, A. Marguerite, P.H. Jouneau, E. Gautier and J.P. Brison and most importantly the PhDs: D. Hykel, K. Ratter, Z.S. Wang, V. Dolocan, C. Veauvy, P. Garcia-Campos.

activ contracts:

A. Marguerite (ESPCI) K. Hasselbach and J.P. Brison (IRIG). ANR SCATE ANR-22-CE30-0040-01

K. Hasselbach (CNRS Neel), P.H. Jouneau, E. Gautier (CEA PFNC) and J.P. Brison (CEA IRIG) Kelvin-Probe IRGA-UGA-2022

publications (selection):

Pablo Garcia-Campos, Y. K. Huang, A. de Visser, and K. Hasselbach. Visualization by scanning SQUID microscopy of the intermediate state in the superconducting Dirac semimetal PdTe2. Phys. Rev. B, 103, 104510 (2021)

D. J. Hykel, C. Paulsen, D. Aoki, J. R. Kirtley, and K. Hasselbach. Magnetic fields above the superconducting ferromagnet UCoGe. Phys. Rev. B, 90:184501, Nov 2014.

C. Paulsen, D. J. Hykel, K. Hasselbach, and D. Aoki. Observation of the Meissner-Ochsenfeld
Effect and the Absence of the Meissner State in UCoGe. Phys. Rev. Lett., 109(23), DEC 3 2012.

V. Dolocan, P. Lejay, D. Mailly, and K. Hasselbach. Observation of two species of vortices in the anisotropic spin-triplet superconductor Sr₂RuO₄. PHYSICAL REVIEW B, 74(14), OCT 2006.

V. Dolocan, C. Veauvy, F. Servant, P. Lejay, Y. Liu, D. Mailly, and K. Hasselbach. Observation of vortex coalescence in the anisotropic spin-triplet superconductor Sr₂RuO₄. Phys. Rev. Lett., 95:097004, August 2005.

C. Veauvy, K. Hasselbach, and D Mailly. Micro-SQUID microscopy of vortices in a perforated superconducting Al film. PHYSICAL REVIEW B, 70(21), DEC 2004.

Micromagnets and Scanning Hall Probe microscopy

collaboration: R. B. G. Kramer, S. LeDemnat, N. Dempsey, PhDs M. Kustov, D. Hykel, M2 P. Laczkowski, Post Doc G. Shaw

F. Dumas-Bouchiat, L. F. Zanini, M. Kustov, N. M. Dempsey, R. Grechishkin, K. Hasselbach,J. C. Orlianges, C. Champeaux, A. Catherinot, and D. Givord. Thermomagnetically patterned micromagnets. APPLIED PHYSICS LETTERS, 96(10), MAR 8 2010.

M. Kustov, P. Laczkowski, D. Hykel, K. Hasselbach, F. Dumas-Bouchiat, D. O’Brien, P. Kauffmann, R. Grechishkin, D. Givord, G. Reyne, O. Cugat, and N. M. Dempsey. Magnetic characterization of micropatterned Nd-Fe-B hard magnetic films using scanning Hall probe microscopy. JOURNAL OF APPLIED PHYSICS, 108(6), SEP 15 2010.

N. M. Dempsey, D. Le Roy, H. Marelli-Mathevon, Gorky Shaw, A. Dias, R. B. G. Kramer, Le VietCuong, M. Kustov, L. F. Zanini, C. Villard, K. Hasselbach, C. Tomba, and F. Dumas-Bouchiat. Micro-magnetic imprinting of high field gradient magnetic flux sources. APPLIED PHYSICS LETTERS, 104(26), JUN 30 2014.

Damien Le Roy, Gorky Shaw, Richard Haettel, Klaus Hasselbach, Frederic Dumas-Bouchiat, Dominique Givord, and Nora M. Dempsey. Fabrication and characterization of polymer membranes with integrated arrays of high performance micro-magnets. MATERIALS TODAY COMMUNICATIONS, 6 :50–55, MAR 2016.

Gorky Shaw, R. B. G. Kramer, N. M. Dempsey, and K. Hasselbach. A scanning Hall probe microscope for high resolution, large area, variable height magnetic field imaging. REVIEW OF SCIENTIFIC INSTRUMENTS, 87(11), NOV 2016.

G. Shaw, J. Brisbois, L. B. G. L. Pinheiro, J. Muller, S. Blanco Alvarez, T. Devillers, N. M. Dempsey, J. E. Scheerder, J. Van de Vondel, S. Melinte, P. Vanderbemden, M. Motta, W. A. Ortiz, K. Hasselbach, R. B. G. Kramer, and A. V. Silhanek. Quantitative magneto-optical investigation of superconductor/ferromagnet hybrid structures. REVIEW OF SCIENTIFIC INSTRUMENTS, 89(2), FEB 2018.

NanoSQUID Development

collaboration: J.R. Kirtley, C. Paulsen, F. Lefloch, T. Crozes, E. André , Post Doc D. Hazra, , PhD P. Garcia-Campos, J.E Duvauchelle, IRAM, PTB Berlin

K. Hasselbach, D. Mailly, and J.R. Kirtley. Micro-superconducting quantum interference device characteristics. JOURNAL OF APPLIED PHYSICS, 91(7) :4432–4437, APR 1 2002.

D. Hazra, J. R. Kirtley, and K. Hasselbach. Nano-superconducting quantum interference devices with continuous read out at milliKelvin temperatures. APPLIED PHYSICS LETTERS, 103(9), AUG 26 2013.

D. Hazra, J. R. Kirtley, and K. Hasselbach. Nano-superconducting quantum interference devices with suspended junctions. APPLIED PHYSICS LETTERS, 104(15), APR 14 2014.

J. E. Duvauchelle, A. Francheteau, C. Marcenat, F. Chiodi, D. Debarre, K. Hasselbach, J. R. Kirtley, and F. Lefloch. Silicon superconducting quantum interference device. APPLIED PHYSICS LETTERS, 107(7), AUG 17 2015.

Pnictides

collaboration: P. Rodière, T. Klein, H. Cercellier, C. Marcenat, M. Saint Paul PhD ZS Wang

P. Rodiere, T. Klein, L. Lemberger, K. Hasselbach, A. Demuer, J. Kacmarcik, Z. S. Wang, H. Q. Luo, X. Y. Lu, H. H. Wen, F. Gucmann, and C. Marcenat. Scaling of the physical properties in Ba(Fe,Ni)(2)As-2 single crystals : Evidence for quantum fluctuations. PHYSICAL REVIEW B, 85(21), JUN 7 2012.

M. Saint-Paul, A. Abbassi, Zhao-Sheng Wang, Huinqian Luo, Xingye Lu, Cong Ren, Hai- Hu Wen, and K. Hasselbach. Elastic anomalies in BaFe2-xNixAs2 crystals. PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 483 :207–212, DEC 2012.

M. Saint-Paul, C. Guttin, A. Abbassi, Zhao-Sheng Wang, Huiqian Luo, Xingye Lu, Cong Ren, Hai-Hu Wen, and K. Hasselbach. Surface impedance of BaFe2-xNixAs2 crystals. SOLID STATE COMMUNICATIONS, 185 :10–13, MAY 2014.

M. Saint-Paul, C. Guttin, A. Abbassi, Zhao-Sheng Wang, Huiqian Luo, Xingye Lu, Cong Ren, Hai-Hu Wen, and K. Hasselbach. Surface impedance in the antiferromagnetic and superconducting states of underdoped BaFe1.93Ni0.07As2 crystals. SOLID STATE COMMUNICATIONS, 192 :47– 50, AUG 2014.

M. Saint-Paul, C. Guttin, A. Abbassi, Zhao-Sheng Wang, Huiqian Luo, Xingye Lu, Cong Ren, Hai- Hu Wen, and K. Hasselbach. Magnetic fluctuations in BaFe2-xNixAs2 superconductors. SOLID STATE COMMUNICATIONS, 267 :48–52, NOV 2017.

CV

University Cursus:

Physics Diploma: – University Karlsruhe 1987: Phase stability of quench condensed metallic films (F. Baumann).

Visiting Scientist (DAAD Scholar): -1988 Specific heat and crystal growth of charge density compounds (J. C. Lasjaunias, P. Monceau, H. v. Löhneysen).

PhD : – Dr. rer. nat. University Karlsruhe 1991: Phasediagrams of the heavy fermion superconductors: UPt₃ and URu₂Si₂ , CNRS-CRTBT, (J. Flouquet and H. v. Löhneysen).

Post Doc:

– 1991 – 1992 setting up UHV LT STM and point contact spectroscopy on URu2Si2 at IBM – T. J. Watson Research Center Yorktown Heights with J. R. Kirtley, as IBM world-trade-fellow.

– 1993 Nano-SQUIDs for micromagnetism with A. Benoît at CNRS-CRTBT, Grenoble as invited scientist.

CNRS

– 1993 Chargé de recherche

– 2007 Directeur de Recherche

Fields of expertise:

– Superconductivity, Magnetism, NanoPhysics, Strongly Correlated Electron Systems, Instrumentation: near field magnetic imaging with NanoSQUID and Hall probes, Low Temperature Physics.

Education administration:

– Supervision of 4 PhD students, (4 defended).

– Co-Supervison of 4 PhD students, (4 defended).

– 2010-2012 member of the evaluation panel SIMI10 (Nanosciences) for the national french funding agency (ANR).

– 2012-2016 member of the national hiring committee of CNRS (CoNRS Section 03).

– 2016–2020 directeur adjoint of Institut Néel (500 persons), director of MCBT (120 persons), one of the three scientific departments of l’Institut Néel.

– 2020–2024 member of PEM council (Physics, Engineering and Materials) of University Grenoble Alpes.

– 2020–2024 member of Labex Lanef Council (Quantum Matter, Cryogenics) of University Grenoble Alpes.

Valorisation:

Co-inventor of two active patents (France and International) (Noble Gaz FIB).

15+ invited talks, 72 publications (among these 11 in refereed conference proceedings).

h-factor 27, 3404 citations without autocitations by 2660 articles.

selected Publications:

K. Hasselbach, L. Taillefer, and J. Flouquet. Critical point in the superconducting phase diagramof UPt₃ . Phys. Rev. Lett.,

(1):93, July 1989

K. Hasselbach, J. R. Kirtley, and J. Flouquet. Symmetry of the gap in superconducting URu₂Si₂ .Phys. Rev. B, 47:509, 1993.

W. Wernsdorfer, EB. Orozco, K. Hasselbach, A. Benoit, D. Mailly, 0. Kubo, H. Nakano, and B. Barbara. Macroscopic quantum tunneling of magnetization of single ferrimagnetic nanoparticles of barium ferrite. Phys. Rev. Lett., 79(20):4014, Nov 1997.

M. Giroud, H. Courtois, K. Hasselbach, D. Mailly, and B. Pannetier. Superconducting proximity effect in a mesoscopic ferromagnetic wire. Phys. Rev. B, 58(18):R11872–5, Nov 1998.

K. Hasselbach, D. Mailly, and JR. Kirtley. Micro-superconducting quantum interference device characteristics. Journal of Applied Physics, 91(7):4432–37, Apr 2002.

C. Veauvy, D. Mailly, and K. Hasselbach. Scanning microsquid force microscope. Rev. of Scientific Instruments, 73:3825, 2002.

C. Veauvy, K. Hasselbach, and D. Mailly. Micro-squid microscopy of vortices in a perforated superconducting Aluminium film. Phys. Rev. B, 70:214513, dec 2004.

V. O. Dolocan, C. Veauvy, F. Servant, P. Lejay, Y. Liu, D. Mailly, and K. Hasselbach. Observation of vortex coalescence in the anisotropic spin-triplet superconductor Sr₂RuO₄ . Phys. Rev. Lett., 95:097004, August 2005.

V. O. Dolocan, P. Lejay, D. Mailly, and K. Hasselbach. Observation of two species of vortices in the anisotropic spin-triplet superconductor Sr₂RuO_4.Phys. Rev. B 74 1445050 2006

C. Paulsen, D. J. Hykel, K. Hasselbach, and D. Aoki. Observation of the Meissner-Ochsenfeld Effect and the Absence of the Meissner State in UCoGe. Phys. Rev. Lett., 109:237001, Dec 2012.

D. J. Hykel, C. Paulsen, D. Aoki, J. R. Kirtley, and K. Hasselbach. Magnetic fields above the superconducting ferromagnet UCoGe. PHYSICAL REVIEW B, 90(18), NOV 4 2014.

D. J. Hykel, Z. S. Wang, P. Castellazzi, T. Crozes, G. Shaw, K. Schuster, and K. Hasselbach. MicroSQUID Force Microscopy in a Dilution Refrigerator. JOURNAL OF LOW TEMPERATUREPHYSICS, 175(5-6):861–867, JUN 2014.

J. E. Duvauchelle, A. Francheteau, C. Marcenat, F. Chiodi, D. Débarre, K. Hasselbach, J. R. Kirtley, and F. Lefloch. Silicon superconducting quantum interference device. Applied Physics Letters, 107(7),2015.

D. Hazra, J. R. Kirtley, and K. Hasselbach. Retrapping current in bridge-type nano-squids. Phys. Rev. Applied, 4:024021, Aug 2015.

Gorky Shaw, R. B. G. Kramer, N. M. Dempsey, and K. Hasselbach. A scanning Hall probe microscope for high resolution, large area, variable height magnetic field imaging. Rev. of Scientific Instruments, 87(11), Nov 2016.

Pablo Garcia-Campos, Y. K. Huang, A. de Visser, and K. Hasselbach. Visualization by scanning SQUID microscopy of the intermediate state in the superconducting Dirac semimetal PdTe₂ . arXiv :2007.08241, 2020. Phys. Rev. B 103 104510 (2021).

SQUID Microscope

Collaborations: J.R. Kirtley, C. Paulsen, D. Aoki, A. de Visser PhD D. Hykel, K. Ratter, Z.S. Wang, V. Dolocan, C. Veauvy, P. Garcia-Campos

Publications on the evolution of the instrument:

K Hasselbach, C. Veauvy, and D. Mailly. MicroSQUID magnetometry and magnetic imaging. PHYSICA C, 332(1-4) :140–147, MAY 2000.

C. Veauvy, K. Hasselbach, and D. Mailly. Scanning µ-superconducting quantum interference device force microscope. REVIEW OF SCIENTIFIC INSTRUMENTS, 73(11) :3825–3830, NOV 2002.

K. Hasselbach, C. Ladam, V. O. Dolocan, D. Hykel, T. Crozes, K. Schuster, and D. Mailly. High resolution magnetic imaging : MicroSQUID Force Microscopy. 8TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS’07), volume 97 of Journal of Physics Conference Series. Univ Gent ; Univ Liege, 2008. 8th European Conference on Applied Superconductivity, Brussels, BELGIUM, SEP 16-20, 2007.

D. J. Hykel, Z. S. Wang, P. Castellazzi, T. Crozes, G. Shaw, K. Schuster, and K. Hasselbach. MicroSQUID Force Microscopy in a Dilution Refrigerator. Journal of Low Temperature Physics, 175(5-6) :861–867, JUN 2014.