Magnetic and Transport Properties of Ce₃Au₃-xPt_xSb_4

抄録

Lattice parameter, electrical resistivity ρ, Hall constant R_H and magnetic susceptibility χ have been measured for Ce₃Au_3-xPt_xSb₄ (x=0.0, 0.5, 1.0, 1.5, 2.25, 3.0). It is found that the alloys for all x show semiconducting behavior. The magnetic susceptibilities for all x obey the Curie-Weiss law at high temperatures and the effective magnetic moments are close to the value for the free Ce³⁺ ion. The paramagnetic Curie temperature increases with increasing x. From the results of the analysis based on a model of a mixture of Ce³⁺ and Ce⁴⁺ ions in Ce₃Au_3-xPt_xSb₄, it is revealed that the concentration of Ce⁴⁺ at low temperatures increase continuously with x and the paramagnetic Curie temperature is directly related to the activation energy between Ce⁴⁺ (J=0) and Ce³⁺ (J=5/2).