Hyperfine Interactions of Cd Impurities in Co-metal

Abstract

The variation with temperature of the magnetic hyperfine field at cadmium impurities in cobalt has been studied in the interval 295 < T < 771 K. The hyperfine field does not follow the temperature variation expected from the bulk magnetization curve of the host and the deviations can be accounted for by the assumption of the formation of a narrow virtual bound state at the impurity. The model used does also explain the anomalies reported for other sp-elements in cobalt. The importance of a temperature dependent sd-hybridization is also stressed.