COMPTON-SCATTERING STUDY OF THE ELECTRONIC PROPERTIES OF THE TRANSITION-METAL ALLOYS FEAL, COAL, AND NIAL

Directional Compton profiles of the transition-metal alloys FeAl, CoAl, and NiAl have been measured. Both a conventional technique (resolution 0.55 a.u. of momentum), based on a 59.3-keV x-ray source with a solid- state detector, and a high-resolution spectrometer (0.15 a.u. of momentum) with 50-keV x rays from a synchrotron source have been used. The results are interpreted using a theory based on a full-potential linearized augmented-plane-wave method. The agreement between the experimental and the theoretical momentum density anisotropy is very good. It is shown that the anisotropies at low momenta are heavily influenced by the particular shape of the Fermi surface. \textcopyright{} 1996 The American Physical Society.