Spin Paramagnetic Susceptibilities of Pd-Ni, Pt-Ni and Pd-Pt Alloys

Abstract

The generalized spin susceptibility of isoelectronic and paramagnetic alloys is calculated by assuming the Wolff-Moriya model in the random phase approximation and in the coherent potential approximation. It is just an extension of Lederer and Mills's result for one impurity system to concentrated alloys. A critical concentration at which ferromagnetism appears can be found from the divergence of the uniform static spin susceptibility of alloys. Uniform static spin susceptibilities of Pd -Ni, Pt -Ni and Pd-Pt alloys are numerically calculated by choosing appropriate values of intra-atomic Coulomb integrals on Pd, Pt and Ni atoms. The calculated results are compared with the experimental results. The estimated values of the intraatomic Coulomb integrals in these alloys are compared with each other.