On the high temperature staggered susceptibility of Heisenberg model antiferromagnetics

The critical ordering temperature, T _c′, for the antiferromagnetic Heisenberg model is investigated on the basis of the high temperature expansion for the staggered susceptibility. For the simple cubic and body-centred cubic lattices, it appears that

where q is the lattice coordination number, S the spin value and T _c the corre-sponding ferromagnetic Curie point. A possible counter argument asserting T _c′ ? T _c is discussed at some length.