Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session E14: Fe-based Superconductors -- Electron Correlation and Orbital Selectivity
8:00 AM–10:48 AM,
Tuesday, March 6, 2018
LACC Room: 304B
Sponsoring Unit: DMP
Chair: Adriana Moreo, Univ of Tennessee, Knoxville
Abstract: E14.00002 : Hund’s Induced Fermi-Liquid Instabilities and Enhanced Quasiparticle Interactions*
8:36 AM–8:48 AM
Hund’s coupling is shown to generally favor, in a doped half-filled Mott insulator, an increase in the compressibility culminating in a Fermi-liquid instability towards phase separation. The largest effect is found near the frontier between an ordinary and an orbitally decoupled (“Hund’s”) metal. The increased compressibility implies an enhancement of quasiparticle scattering, thus favoring other possible symmetry breakings. This physics is shown to happen in simulations of the 122 Fe-based superconductors, possibly implying the relevance of this mechanism in the enhancement of the critical temperature for superconductivity.
*The author is supported by the European Commission through the ERC-StG2016, StrongCo- Phy4Energy, GA No724177.
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