The evolution of magnetic order in CrFe alloys. III. Ferromagnetism close to the critical concentration

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Abstract
For pt.II see ibid., vol.13, p.451 (1983). The results of a series of neutron small-angle scattering measurements on ferromagnetic CrFe alloys close to the critical concentration for ferromagnetism (cF) have been analysed to yield the concentration and temperature dependence of the magnetic inverse correlation range, kappa 1(c,T). It is found that kappa 1 does not go to zero at Tc, but varies as (c-cF)((T-TC)/TC)nu + kappa R where nu =1.2+or-0.1. At low temperatures the alloys showed significant long-range inhomogeneity in the ferromagnetic correlations; this became more pronounced as the concentration approached cF. These features are discussed in relation to the other complex magnetic properties of these highly disordered ferromagnets.