Hund's Induced Fermi-Liquid Instabilities and Enhanced Quasiparticle Interactions

被引：41

作者：

de' Medici, Luca ^{[1
,2
]}

机构：

[1] European Synchrotron Radiat Facil, 71 Ave Martyrs, Grenoble, France

[2] UMR8213 CNRS ESPCI UPMC, Lab Phys & Etude Mat, Paris, France

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 118卷 / 16期

关键词：

IRON PNICTIDES; PHASE-SEPARATION; SUPERCONDUCTORS; CHALCOGENIDES; MECHANISM; SYSTEMS; POINT; MODEL;

D O I：

10.1103/PhysRevLett.118.167003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：5

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