Ferromagnetic critical correlations in AuFe re-entrant ferromagnets

From the paramagnetic critical neutron scattering of Au0.82Fe0.18 we derive the absolute values of the neutron bulk susceptibility χq=0(T). The excellent agreement between χq=0(T) and the susceptibility, measured with a Faraday balance, validates our analysis, in the frame of the Ornstein-Zernicke formalism, and the resulting enhancement of the critical correlations by the disorder.