Temperature dependence of the resistivity due to localized spin fluctuations. II. Coles alloys

Abstract

The resistance anomaly discovered by Coles in RhFe and occurring in several similar dilute alloys is shown to be of the same nature as the Kondo anomaly. The resistivity is due to localized spin fluctuations (LSF) and is given by a universal function of the temperature, increasing as T², T and in T to tend finally to the unitarity limit. The characteristic knee occurs at the spin fluctuation temperature T_sf and marks the onset of the logarithmic regime. Above T_sf there is no qualitative difference between the resistivity due to LSF and that caused by a well defined localized magnetic moment.