Effects of Spin Fluctuations in Transition Metals and Alloys

Abstract

The paramagnetic susceptibility for transition metals, alloys and compounds is calculated from a realistic itinerant electron model taking into account the effect of spin fluctuations (SF) in the static Gaussian approximation (SGA). The magnetic free energy based on the Stoner model is averaged over longitudinal and transverse SF. On the basis of values which were calculated for the electronic density of states, molecular field coefficient, exchange stiffness coefficient,and the orbital susceptibility, the temperature variation of the paramagnetic susceptibility is calculated for several transition metals, alloys, and compounds and is compared with experiment. It is concluded that SGA applied to a realistic Stoner model is sufficient to explain the temperature variation of the paramagnetic susceptibility in itinerant electron magnets not only qualitatively, but very often even quantitatively. The present theory is compared with other theories of SF in itinerant electron magnets.