UNSPECIFIED. (2000) Spin-dependent electron momentum density in Fe3Si and Fe3Al. JOURNAL OF PHYSICS-CONDENSED MATTER, 12 (32). pp. 7229-7241. ISSN 0953-8984

Abstract

Circularly polarized synchrotron radiation of energy 200 keV has been used to study the spin dependent electron momentum distributions in Fe3Al and Fe3Si single crystals at room temperature through magnetic Compton profile measurements. The experiments were carried out for the crystallographic directions [100], [110] and [111] in Fe3Si, and [100] and [111] in Fe3Al. These results show that there is a more significant negative conduction electron spin polarization in both alloys than neutron data indicate and it is similar to that in pure iron. The overall characteristics of the experimental magnetic Compton profiles, as well as directional anisotropies, were found to be qualitatively similar for both compounds; however the anisotropy is higher in the case of Fe3Si. The majority and minority spin band profiles have been extracted and show that large anisotropies are associated with the latter. Their calculated anisotropy at low momenta was fully confirmed. The ab initio KKR calculation reproduces the Fe3Si profiles relatively well, but a 'fixed-spin moment approach' was needed in order to describe the Fe3Al spin density momentum distribution.

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