Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 3: Magnetic Semiconductors

MA 3.1: Vortrag

Montag, 25. Februar 2008, 10:15–10:30, H 1012

Influence of correlation effects on the magnetic properties of half-metallic ferromagnets — •Stanislav Chadov¹, Jan Minár¹, Hubert Ebert¹, Mikhail Katsnelson², and Alexander Lichtenstein³ — ¹Dept. Chemie und Biochemie, Physikalische Chemie, Universität München, Butenandtstr. 5-13, D-81377 München, Germany — ²Institute for Molecules and Materials, Radboud University Nijmegen, NL-6525 ED Nijmegen, The Netherlands — ³Institute of Theoretical Physics, University of Hamburg, Germany

In contrast to the Heisenberg magnets and itinerant ferromagnets an interesting feature of the half-metallic Heusler alloys is that the Rodes-Wolfarth ratio can be essentially smaller than unity. This property can be used for their preliminary experimental identification. We present results for magnetic moments of the half-metallic ferromagnets calculated within the relativistic full potential Korringa-Kohn-Rostoker (KKR) method. Particular attention is paid to the influence of local correlation effects which make a noticeable influence on the reduction of the local magnetic moment with increase of the temperature. Local correlations are taken into account within the framework of the Dynamical Mean Field Theory (DMFT) combined with the KKR in a fully self-consistent scheme. The relativistic version of the DMFT solver used in the present work allows to take the temperature dependence of the local correlations explicitly into account. A comparison of theoretical results with corresponding experimental data is presented.