Low−temperature heat−capacity study of the Y1−xThxFe3 system

Abstract

Low-temperature heat-capacity measurements between 1.5 and 10 OK have been made on some compounds in the Y 1 -x ThxFe3 system (x =0.1, 0.3, 0.5, 0.7, 0.9, and 1.0). The electronic specific-heat coefficient ' Y exhibits a maximum at x =0.3. The lattice specific-heat coefficient /3 increases, while the Debye temperature 6 D decreases with increasing x. The results of this study are in agreement with a model proposed to explain the anomalous magnetic behavior of the Y 1-, Th, Fe3 system. The variation of ' Y as a function of x is discussed in tenns of a band model for the 3d transition metals.