A need for high-resolution Compton scattering study of hcp metals with the use of synchrotron radiation

Compton profiles of hexagonal structure metals (Mg, Zn and Cd) were measured using high energy (662 keV – 137Cs isotope gamma source) and medium resolution (0.4 a.u.) Compton spectrometer in the Institute of Experimental Physics, University of Bialystok. The experimental data were compared with corresponding first principles Korringa–Kohn–Rostoker coherent potential approximation calculations (KKR-CPA).Small anisotropy of Compton profiles measured in all three metals makes the observation of fermiological features extremely difficult. We show that to achieve this goal, high-resolution experimental data are essential. Judging from the recently obtained results for a much easier case of cubic Ni75Cu25 and Ni75Co25 alloys, one needs the resolution to be below about 0.15 a.u. Such an experiment can be carried out at the synchrotron radiation source only with the energy above 40 keV.