Positron-annihilation study of the half-metallic ferromagnet NiMnSb: Theory
- 15 October 1986
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 34 (8), 5009-5016
- https://doi.org/10.1103/physrevb.34.5009
Abstract
Calculations of the electronic structure, the Fermi surface, and the momentum density of annihilation photon pairs are presented in preparation for an experimental study of the half-metallic ferromagnet NiMnSb with the aid of the two-dimensional angular correlation of annihilation radiation technique. The band structure obtained is in good agreement with former calculations and consists of a metallic majority-spin and a semiconducting minority-spin band. The majority-spin Fermi surface consists of three Γ-centered hole sheets, two of which have necks at L. The different nature of the bands is clearly reflected in the spin-dependent momentum densities. From these densities a magnetic difference effect in the angular correlation can be derived which should be clearly observable with polarized positrons.Keywords
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