Clustering and Giant Moments in Cu–Ni Alloys

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Abstract
There are several studies of paramagnetic susceptibility and neutron diffraction revealing the presence of giant moments associated with chemical clustering. However, in contrast to the paramagnetic state, there are but few analogous studies extending below Tc . We prepared Cu–Ni alloys of about 50–50 composition as Mössbauer sources containing 57Co. Internal fields, Tc , and isomer shifts were determined as functions of composition and heat treatment. The temperature dependence of the hyperfine spectrum changes very little as a result of annealing at low temperature. Nevertheless, the value of Tc itself dramatically increases in response to clustering, and the isomer shift and internal field at ∼0°K are singificantly altered in response to the change in chemical short‐range order.

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