Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 33: Postersession Correlated Electrons: Metal Insulator Transition, Spin Systems and Itinerant Magnets

TT 33.21: Poster

Mittwoch, 25. März 2009, 14:00–18:00, P1A

The ground state phase diagram of the ferromagnetic Kondo-lattice model — •Sören Henning and Wolfgang Nolting — Humboldt Universität zu Berlin; Institut für Physik; AG Festkörpertheorie; Newtonstr.15; 12489 Berlin

The magnetic ground state phase diagram of the ferromagnetic Kondo-lattice model is constructed by calculating internal energies of all possible bipartite magnetic configurations of the simple cubic lattice explicitly. This is done in one dimension (1D), 2D and 3D assuming a local moment of S=3/2 and a saturated sub-lattice magnetization. As will be shown, it is possible to treat all higher local correlation functions appearing in the many-body problem exactly under these assumptions. A simple explanation for the obtained phase diagram in terms of bandwidth reduction is given. Regions of phase separation are determined from the internal energy curves by an explicit Maxwell construction.