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TT: Fachverband Tiefe Temperaturen

TT 21: Solids at Low Temperature - Poster Session

TT 21.10: Poster

Mittwoch, 28. März 2007, 14:00–17:45, Poster A

Dynamical mean-field theory of half-metallic ferromagnets — •Eberhard Jakobi, Nils Blümer, and Peter van Dongen — KOMET 337, Institut für Physik, Universität Mainz, Staudingerweg 7, 55099 Mainz

Spintronics applications require materials with high spin polarization; therefore, half-metallic ferromagnets are of strong practical interest. Candidates for half-metallic behavior at sufficiently high temperatures include Heusler compounds as well as double perovskites. Previous studies for these materials were mostly restricted to density functional theory (DFT) within local spin-density approximation (LSDA). We investigate multi-band Hubbard models as relevant for half-metallic ferromagnets within Dynamical mean-field theory (DMFT) using weak-coupling perturbation theory and quantum Monte Carlo (QMC) simulations. Thereby we are able to treat electronic correlations beyond the level of conventional band structure calculations.