Abstract
The elastic diffuse scattering of neutrons from ferromagnetic Ni-Cu alloys of 2-40 at.% Cu has been measured at 4.2°K. Analysis of the results within the formalism of Marshall yields a description of the magnetic-moment distribution among the various atoms. The disturbance in moment produced by a copper atom at dilute concentrations appears to be confined almost completely to its nickel near neighbors, which is consistent with the short-range chemical screening effects predicted from coherent-potential theory. At higher copper concentrations, the moment disturbance extends over several neighbor shells, and it is argued that this longer-range effect is predominantly magnetic in origin. Inasmuch as the bulk moment per atom also contains a contribution from a uniform conduction-electron polarization , the average nickel and copper moments and can only be determined in terms of the combinations and . The quantity , whose major component is probably , has a constant value of about over the entire composition range studied.
- Received 9 August 1972
DOI:https://doi.org/10.1103/PhysRevB.7.218
©1973 American Physical Society