Nuclear magnetic susceptibility of metals with magnetic impurities

TL;DR

This paper investigates how magnetic impurities affect the nuclear magnetic susceptibility and specific heat in metals, revealing temperature-dependent behaviors and the influence of impurity interactions.

Contribution

It introduces a detailed analysis of impurity contributions to nuclear susceptibility and heat capacity, highlighting the suppression of RKKY interactions in dirty metals.

Findings

Impurity contribution to susceptibility varies as 1/T^2.

Impurity contribution to specific heat varies as 1/T.

RKKY interaction is suppressed in dirty metals at low T.

Abstract

We consider the contribution of magnetic impurities to the nuclear magnetic susceptibility $\chi$ and to the specific heat $C$ of a metal. The impurity contribution to the magnetic susceptibility has a $1/T^2$ behaviour, and the impurity contribution to the specific heat has a $1/T$ behaviour, both in an extended region of temperatures $T$. In the case of a dirty metal the RKKY interaction of nuclear spins and impurity spins is suppressed for low temperatures and the main contribution to $C$ and $\chi$ is given by their dipole-dipole interaction.