Hund's induced Fermi-liquid instabilities and enhanced quasiparticle interactions
Strongly Correlated Electrons
2017-04-20 v1 Superconductivity
Abstract
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 about 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 the critical temperature for superconductivity.
Cite
@article{arxiv.1609.01303,
title = {Hund's induced Fermi-liquid instabilities and enhanced quasiparticle interactions},
author = {Luca de' Medici},
journal= {arXiv preprint arXiv:1609.01303},
year = {2017}
}