Magnetic response of nonmagnetic impurities in cuprates

TL;DR

This paper presents a theoretical model explaining how nonmagnetic impurities induce local magnetic responses in doped antiferromagnets like cuprates, linking impurity effects to bulk magnetic properties and doping levels.

Contribution

It introduces a theory connecting local magnetic responses to bulk spin correlations and collective modes, explaining impurity effects in cuprates.

Findings

Kondo-like behavior of local susceptibility explained

Doping increases Kondo temperature, indicating Fermi liquid crossover

Magnetization distribution aligns with bulk antiferromagnetic correlations

Abstract

A theory of the local magnetic response of a nonmagnetic impurity in a doped antiferromagnet, as relevant to the normal state in cuprates, is presented. It is based on the assumption of the overdamped collective mode in the bulk system and on the evidence, that equal-time spin correlations are only weakly renormalized in the vicinity of the impurity. The theory relates the Kondo-like behavior of the local susceptibility to the anomalous temperature dependence of the bulk magnetic susceptibility, where the observed increase of the Kondo temperature with doping reflects the crossover to the Fermi liquid regime and the spatial distribution of the magnetization is given by bulk antiferromagnetic correlations.