Calculation of Paramagnetic Susceptibilities for B.C.C. Transition Metals and Their Alloys

Abstract

The approximate energy bands for Cr, Mo and W metals are built up from the energy bands for the paramagnetic Cr metal, by taking into account the spin-orbit interaction. The effect of the spin-orbit interaction to the paramagnetic susceptibilities for 3d, 4d and 5d b.c.c. transition metals and their alloys are investigated. The spin paramagnetic susceptibilities χ_s and the orbital paramagnetic susceptibilities χ_orb for 3d metals and their alloys are the largest, followed by those for 4d and 5d metals and their alloys in that order, and the mixed contribution due to the spin and orbital angular momentums, χ_so, is negligibly small. The calculated paramagnetic susceptibilities agree with the results of the experiments, by adopting the reasonable values of a molecular field coefficient. The method to analyze the paramagnetic susceptibilities for the alloys composed of 3d and 4d, 4d and 5d or 3d and 5d transition metals is suggested and the experimental results for V–Nb and Nb–Ta alloys are analyzed.