A small magnetic cluster is shown to exist around an isolated Fe atom in Cu_1-XNiX alloys with a magnetic moment and saturation hyperfine field depending on the number n of Ni near neighbors. This small cluster changes abruptly from moments of (2.85+0.6n)×μB to large moments [(~17 to 20)μB] for Ni concentrations near the critical composition. The moment compensation (Kondo effect) found for isolated Fe in Cu appears to persist in Cu-Ni up to at least 10 at.% Ni.
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Bennett et al. (1969) studied this question.
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