Significant differences between modern band theories proposed for Cu-Ni solid solutions leave uncertain the mechanism responsible for their observed ferromagnetism. X-ray spectroscopy, a sensitive probe of the relevant unfilled $3d$ states, appears to agree with ferromagnetic coherent-potential-approximation (CPA) calculations but not with paramagnetic CPA or average-T-matrix-approximation calculations. Repeated K-edge measurements and new L absorption edges of Cu and Ni are internally self-consistent and agree with published M spectra but not with the related appearance-potential spectra.
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Cordts et al. (1980) studied this question.
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