Abstract
Several aspects of half-metallic magnetism at finite temperature are discussed. SinceNiMnSb is the simplest half-metal and the longest known it will be used as an example.Also it is a half-metal with remarkable little on-site Coulomb repulsion. Consequently it isa half-metal that is not notably corrupted by non-quasiparticle states. There exists ananomaly at 90 K, described before, that will be shown to be unrelated to the position of theFermi level in the bandgap. Several substitutions are investigated that could shedsome light on the origin of the transition. The calculated phonon spectrum iscompared with experimental neutron scattering data. Finally, the spin-polarization ofinterfaces of NiMnSb with the transition metal based non-magnetic semiconductorsNiTiSn and CoTiSb is investigated and the electronic structure of an infinitetwo-dimensional array of NiMnSb quantum dots embedded in NiScSb is reported.
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