The low temperature resistivity of RhFe

Abstract

Measurements have been made of the resistivity of some rhodium-iron alloys, whose concentrations lie between 40 ppm and 2.2 at% or iron, in the temperature range 0.5 to 30K. The resistivities of samples of 0.06% and 0.5% Fe were also measured down to 0.02K. Comparison is made between the data for the more dilute alloys and the spin fluctuation theory of the resistance anomaly which, in contrast with the Kondo resistance minimum behaviour, shows a large positive temperature coefficient. The effects of interactions between iron solute atoms are observed as a function of concentration and the data give strong, if indirect, evidence that magnetic ordering to a spin glass state takes place at low temperatures in alloys containing more than about 0.5%Fe, while at lower concentrations the ground state is nonmagnetic.