Magnetic Properties of Ni–Pd, Ni–Pt and Pd–Pt Alloys

Abstract

The average density of states and the local density of states for the paramagnetic and ferromagnetic Ni–Pd, Ni–Pt and Pd–Pt alloys are calculated by the coherent potential approximation by taking account of an off-diagonal randomness. The Hubbard model is assumed and the Hartree-Fock approximation is used. It is found that the band-width of these alloys changes nearly linearly with concentration. The peak of the density of states near the Fermi level remains without large distortion by alloying and that of the local density of states is similar to that of each pure metal. The bulk and local magnetic moments, paramagnetic spin susceptibility and low temperature specific heat coefficient are calculated. These results are compared with experiments and qualitative agreements are obtained.