Spin Liquid Behavior in Electronic Griffiths Phases

TL;DR

This paper investigates how disorder-induced sub-Ohmic dissipation suppresses Kondo screening, resulting in a universal spin-liquid state in electronic Griffiths phases, using advanced dynamical mean-field theory techniques.

Contribution

It introduces a novel understanding of spin-liquid behavior arising from the interplay of Kondo effect and RKKY interactions in disordered systems.

Findings

Sub-Ohmic dissipation occurs at strong disorder levels.

Kondo screening is suppressed on a finite fraction of spins.

Universal spin-liquid behavior emerges due to disorder effects.

Abstract

We examine the interplay of the Kondo effect and the RKKY interactions in electronic Griffiths phases using extended dynamical mean-field theory methods. We find that sub-Ohmic dissipation is generated for sufficiently strong disorder, leading to suppression of Kondo screening on a finite fraction of spins, and giving rise to universal spin-liquid behavior.