Susceptibility of Paramagnetic Ni-Cu Alloys

A model for paramagnetic Ni-Cu alloys is proposed, wherein magnetic clusters with giant moment (∼ 10${\mathrm{\mu }}_{\mathrm{B}}$) interact via the itinerant electrons. The interaction is shown to oscillate in space with a wavelength of the order of the cluster size. A Curie-Weiss susceptibility results in $\theta$ becoming negative (antiferromagnetic interaction) at low Ni concentration.