Magnetic moment formation at a dilute Ce(140) impurity in RCo_2 compounds

TL;DR

This paper theoretically investigates the local magnetic moments and hyperfine fields of dilute Ce(140) impurities in RCo_2 compounds, aligning well with experimental PAC measurements and comparing with previous Ta impurity results.

Contribution

It introduces a simple model to calculate impurity magnetic moments and hyperfine fields in RCo_2, providing theoretical support for experimental findings.

Findings

Good agreement with experimental hyperfine field data

Theoretical calculation of impurity magnetic moments

Comparison with previous Ta impurity results

Abstract

A great deal of experimental work using perturbed angular correlation (PAC) has succeed in measuring hyperfine fields in Ce diluted in metallic systems, thus allowing the determination of the local impurity moment at low temperatures. Motivated by such experimental work on Ce(140) placed on a R site of the rare earth (R = Gd, Tb, Dy, Ho, Er) in RCo_2, we theoretically discuss, within a simple model, the local magnetic moments and thereby calculate the magnetic hyperfine fields. The results are in good agreement with the experimental data. For the sake of comparison we recall our previous results on Ta d-impurity embedded in the same hosts.