Anomalous Resistivity of Dilute MoMn, MoFe and MoCo Alloys

Abstract

The resistivities of a series of dilute MoMn, MoFe and MoCo alloys were measured between 1.5 K and room temperature in order to understand the nature of the s-d exchange interaction in these alloys. It was found that the resistivity of MoCo and MoFe shows a normal Kondo effect with a Kondo temperature of 46±2 K and about 0.3 K, respectively, while the resistivity of MoMn shows a positive temperature coefficient with a characteristic temperature of 17±4 K, which is considered as the Kondo temperature of this alloy. In addition to these anomalies due to magnetic scattering, a peak was observed at about 50 K in the resistivity of all the alloys studied. This peak was attributed to the differing anisotropies of the relaxation times for impurity and phonon scattering.