Y.J. Uemura (Columbia University - USA)

  Version imprimable de cet article RSS

contact : benoit.fauque@espci.fr

26 juin 2012 14:00 » 16:00 — A5 (Holweck)

Controling Parameters of Tc in Unconventional Superconductors

Accumulation of experimental data on unconventional superconductors has shown various correlations between Tc and possible controling parameters, including superfluid density, resonance mode energy, gap energy, spin fluctuation energy J, and possibly others.

I have been advocating two view points (1) Charge energy scale (T_F) derived from superfluid density and spin energy scale (J) are often comparable, and together determine evolution of Tc versus doping / pressurizing. (2) The resonance mode energy, like rotons in superfluid He, represents closeness of the superconducting state to the competing (magnetic) state, and works as an additional separate parameter in addition to T_F and J.

In this talk, I will discuss these pictures with recent results in CeCo(In,Sn)5 and FeAs supercondutors.





ÉCOLE SUPÉRIEURE DE PHYSIQUE ET DE CHIMIE INDUSTRIELLES DE LA VILLE DE PARIS
10 Rue Vauquelin, 75005 Paris