Mercredi 15 avril 2015 à 15h00 C.S.N.S.M. - Bât. 108 - Salle de conférence
Unconventional superconductivity has been observed in a growing class of materials that appear neither identical to the conventional superconductors, nor related to each other. In this talk, I will present a comprehensive analysis of the superconducting phase of more than 25 different materials belonging to various families within the copper-oxides, heavy-fermions, organics, and the recently discovered iron-pnictides, iron-chalcogenides, and oxybismuthides. We find that when multiple tuning (e.g., pressure on doped samples etc.) is employed, new insights regarding both the superconducting (SC) and the ‘parent’ normal state properties are revealed. Our main finding is that most of the SC domes are actually an overlap of two disconnected SC domes : The dome near the quantum critical point, if exists, usually has a lower transition temperature (Tc), while the second SC dome appearing around a non-Fermi liquid (NFL) background has higher Tc. I will conclude with establishing universality and extracting common parameter (s) across all these materials, and thereby proposing a generic route to higher-Tc superconductivity.
Reference : T. D. Christos Panagopoulos, under review.
Voir en ligne : Site web de Tanmoy Das
Renseignements CSNSM : Hélène le Sueur/ Stéphanie Roccia 01 69 15 52 25/52 15