J J Attema et al 2007 J. Phys.: Condens. Matter 19 315212 doi:10.1088/0953-8984/19/31/315212
J J Attema1, G A de Wijs1 and R A de Groot1,2
Show affiliationsSeveral aspects of half-metallic magnetism at finite temperature are discussed. Since NiMnSb 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 is a half-metal that is not notably corrupted by non-quasiparticle states. There exists an anomaly at 90 K, described before, that will be shown to be unrelated to the position of the Fermi level in the bandgap. Several substitutions are investigated that could shed some light on the origin of the transition. The calculated phonon spectrum is compared with experimental neutron scattering data. Finally, the spin-polarization of interfaces of NiMnSb with the transition metal based non-magnetic semiconductors NiTiSn and CoTiSb is investigated and the electronic structure of an infinite two-dimensional array of NiMnSb quantum dots embedded in NiScSb is reported.
71.20.-b Electron density of states and band structure of crystalline solids
73.20.At Surface states, band structure, electron density of states
Condensed matter: electrical, magnetic and optical
Issue 31 (8 August 2007)
Received 7 November 2006, in final form 10 May 2007
Published 3 July 2007
J J Attema et al 2007 J. Phys.: Condens. Matter 19 315212
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