Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 25: Correlated Electrons - Poster Session

TT 25.102: Poster

Mittwoch, 29. März 2006, 14:30–18:30, P1

T=0-phase diagram of the Kondo-lattice model with quantum localized spins — •Jochen Kienert and Wolfgang Nolting — Humboldt-Universität zu Berlin*Institut für Physik*Theoretische Festkörperphysik*Newtonstraße 15*D-12489 Berlin

The ferromagnetic/non-ferromagnetic phase diagram of the Kondo-lattice model is determined at T=0 in 2D and 3D. Our approach takes into account the quantum character of the localized magnetic moments, which often are treated classically in studies of this model. Consequently, special emphasis is put on the comparison between quantum and classical spins (S→ ∞). The maximum region of ferromagnetic stability is reduced for small spins. We compare our findings with results based on different methods by other authors.