Berlin 2005 – scientific programme

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MA: Magnetismus

MA 9: FV-internes Symposium "Heusler-Legierungen" (Organizers: B. Hillebrands, H. Zabel)

MA 9.4: Invited Talk

Friday, March 4, 2005, 16:45–17:15, TU EMH225

Interplay of defects and temperature in NiMnSb — •Robert A. de Groot, Jisk Attema, Liviu Chioncel, Changming Fang, Gilles A. de Wijs, and Alex I. Lichtenstein — ESM, Toernooiveld 1, Nijmegen, The Netherlands

The electronic structure of NiMnSb, the origin of the band gap for one spin-direction as well as the influence of intrinsic defects are discussed. Intrinsic point-defects are unlikely or have a negligible effect but the effect of the surface is detrimental for the half-metallic properties. Genuinely half-metallic interfaces with zinc-blende semiconductors are possible however, and the underlying physics will be discussed. Finally, possibilities of introducting non-intrinsic defects will be explored in order to optimize the spin-polarization of the conduction at finite temperatures through the modification of the magnon density of states.