Resistance Minimum Phenomena in Exchange Enhanced Pd and Pt Alloys

Abstract

The magnetic susceptibility and solute resistivity of Cr impurity in Pd_1−cRh_c (c=0, 0.01, 0.04, 0.05, 0.08 and 0.10) and Pt were measured. The residual resistance of Cr solute impurity showed the maximum at the Rh concentration that the exchange enhancement of host alloy becomes largest. At the temperature below 10°K the solute resistivity obeys T² and the coefficients of T² term also show the maximum at about the same Rh concentration. A large decrease of the magnetic susceptibility of Pd_1−cRh_c alloys by addition of Cr impurity was observed and such a decrease and temperature dependence are interpreted by the negative polarization of neighbouring Pd atoms.