Spin-polarized electron momentum density distributions in (formula presented) alloys

Abstract

The spin-polarized momentum densities of disordered single-crystal (formula presented) have been studied using the magnetic Compton scattering technique, for the compositions (formula presented) and 0.28. Magnetic Compton profiles have been measured along the three principle crystallographic directions in each sample, and compared with theoretical profiles calculated using the Korringa-Kohn-Rostoker coherent-potential approximation method. The calculated and measured spin-polarized momentum distributions, as revealed by their magnetic Compton profiles, are in excellent agreement. However the calculated spin moment for the composition with (formula presented) is some 10% smaller than that measured experimentally, and for (formula presented) the deviation becomes 15%. These differences are attributed to the effect of order in the samples, which becomes increasingly important in the Pd-rich side of the phase diagram. The orbital component to the magnetization has been determined as 0.08 and (formula presented) for (formula presented) and (formula presented) respectively. © 2001 The American Physical Society.