FERROMAGNETIC ORDERING IN DILUTE PDCO ALLOYS

The analysis of magnetization and neutron-scattering measurements show s that the ferromagnetic cloud in dilute PdCo alloys has a size of 7.9 2muB, with a Co moment of 2.02mu(B), for a range of concentrations of 0.3 less-than-or-equal-to c less-than-or-equal-to 2.0 at. % Co. Using the values obtained by our analysis of the data, the neutron scatterin g and the critical temperatures of ferromagnetism are reproduced using a localized magnetic moment model with a Heisenberg type of interacti on between clouds and Monte Carlo simulation methods. The calculated n eutron scattering shows a strong component of critical scattering in t he unpolarized neutron; this component is the cause of the larger valu e of the ferromagnetic cloud (approximately 10mu(B)) that can be infer red from the neutron scattering. Agreement is also found between calcu lated critical temperatures and experimental T(c)'s at these values of concentrations.