On the High-Temperature Susceptibility for the Heisenberg Model of a Ferromagnet

Abstract

The paper deals with the high-temperature expansions, in powers of T-1, of the susceptibility, χ, and the inverse susceptibility, χ-1, for the Heisenberg model of a ferromagnet. Expressions, valid for any lattice, are given for the coefficients in these expansions, up to and including the coefficient of T-5. The results are discussed numerically, for particular lattices, in their bearing on the Curie temperature.