Unraveling the mystery of the physical mechanism leading to high temperature superconductivity remains one of the most challenging issues of modern solid-state physics. Indeed, a priori, the conventional electron-phonon coupling mechanism cannot explain such high critical temperatures. 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. In order to unveil the mechanism leading to high temperature superconductivity we look at different family of compounds by means of complementary probes. The global aim was to determine the microscopic ingredients involved in both the formation of superconductivity and the electronic/magnetic states of each families.
Optique et Matériaux - OPTIMA
Rassembler une chaine de compétence complète qui va de la synthèse et l’élaboration de matériaux nouveaux à l’étude des propriétés optiques non linéaires et plasmoniques
Micro et NanoMagnétisme - MNM
Complementary expertise in fabrication, characterisation, and simulations for studies in nanomagnetism with applications in spin electronics and micro-systems
Systèmes Hybrides de basse dimensionnalité - HYBRID
Propriétés électroniques, optiques, vibrationnelles, mécaniques, et leur couplage à l’échelle quantique, de nouveaux systèmes hybrides (nanotubes, graphène, matériaux bi-dimensionnels, fonctionnalisés) que l’équipe développe.
Charge density wave and superconductivity
Recently attention to the dichalcogenide superconductors has been revived thanks to the observation of charge order in the cuprate high temperature superconductors. Indeed, since 2008, more and more experiments... > suite
Heavy-fermions : magnetism and superconductivity
Strong electronic correlations can have two origins : either coulomb repulsion between electrons in the case of Mott physics, or magnetic correlations mediated by the conduction electrons in intermetallic compounds.... > suite
High temperature superconductors
In all unconventional materials, superconductivity appears in the vicinity of a competing magnetic, electronic and/or lattice instability. The transition temperature of this competing instability progressively... > suite
Electrical resistance is one of the few physical quantities that is spanning all the way from zero (in superconductors) to infinity (in insulators at T = 0 K). Doping insulators to obtain new superconductors may... > suite