Correlation induced spin freezing transition in FeSe: a dynamical mean field study

TL;DR

This study uses dynamical mean field theory to investigate how local Coulomb interactions induce a spin freezing transition in FeSe, revealing non-Fermi-liquid behavior and the effects of doping.

Contribution

It demonstrates the role of local Coulomb interactions in causing spin freezing and non-Fermi-liquid behavior in FeSe using a dynamical mean field approach.

Findings

Non-Fermi-liquid behavior caused by local moment formation

Fermi-liquid properties are restored at high electron doping

FeAsLaO remains on the Fermi-liquid side of the transition

Abstract

The effect of local Coulomb interactions on the electronic properties of FeSe is explored within dynamical mean field theory combined with finite-temperature exact diagonalization. The low-energy scattering rate is shown to exhibit non-Fermi-liquid behavior caused by the formation of local moments. Fermi-liquid properties are restored at large electron doping. In contrast, FeAsLaO is shown to be located on the Fermi-liquid side of this spin freezing transition.