Magnetic Property of (Co, Ni)_1.67Ge

Abstract

The susceptibilities of Co_1.67Ge and Ni_1.67Ge are nearly independent of temperature, and the values are 4.9×10⁻⁶ and 0.4×10⁻⁶ emu/g respectively. From the magnetic measurement on a series of alloys of (Co, Ni)_1.67Ge, it is concluded that these alloys are of Pauli paramagnetism. The density of states is calculated as a function of energy, and then the effective mass ratio is estimated on the basis of the free electron theory. The ratio m^*⁄m is about 28 for cobalt rich side, and 5 for nickel rich side. Therefore the magnetism of Co_1.67Ge and Ni_1.67Ge may be ascribed to the Pauli paramagnetism of 3d holes and 4s electrons respectively. These conclusion is consistent with a theory previously proposed.