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-orbitinteraction to the paramagnetic susceptibilities for 3 d , 4 d and 5 d b.c.c. transition metals and their alloys are investigated. The spin paramagnetic susceptibilities χ _s and the orbital paramagnetic susceptibilities χ _orb for 3 d metals and their alloys are the largest, followed by those for 4 d and 5 d 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 3 d and 4 d , 4 d and 5 d or 3 d and 5 d transition metals is suggested and the experimental results for V–Nb and Nb–Ta alloys are analyzed.