Correlated disorder in Kondo lattice

TL;DR

This paper investigates how correlated disorder affects the coherence temperature in Kondo lattices, revealing that impurity correlations can mitigate disorder's suppressive impact, aligning with experimental observations.

Contribution

It introduces a mean-field approach to analyze the influence of impurity correlations on coherence in disordered Kondo lattices, a novel aspect in heavy-fermion research.

Findings

Impurity correlations reduce the suppression of coherence temperature.

Increased impurity concentration diminishes disorder effects.

Results align with recent experimental data.

Abstract

Motivated by recent experiments on disordered heavy-fermion materials, we study the effect of correlated disorder in Kondo lattice. Correlations between the impurities are considered at the two-particle level. We use mean-field theory approximation for the Anderson lattice model to calculate how the emergence of coherence in the Kondo lattice is impacted by correlations between impurities. We show that the rate at which disorder suppresses coherence temperature depends on the length of impurity correlations. As impurity concentration increases, we generally find that the suppression of coherence temperature is significantly reduced. The results are discussed in the context of available experimental data.