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 (resoluti on 0.55 a.u. of momentum), based on a 59.3-keV x-ray source with a sol id-state detector, and a high-resolution spectrometer (0.15 a.u. of mo mentum) with 50-keV x rays from a synchrotron source have been used. T he results are interpreted using a theory based on a full-potential li nearized augmented-plane-wave method. The agreement between the experi mental and the theoretical momentum density anisotropy is very good. I t is shown that the anisotropies at low momenta are heavily influenced by the particular shape of the Fermi surface.