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TT: Fachverband Tiefe Temperaturen

TT 32: Correlated Electrons: Poster Session

TT 32.67: Poster

Donnerstag, 28. Februar 2008, 14:00–18:00, Poster B

The ground state phase diagram of the Kondo-lattice model — •Sören Henning and Wolfgang Nolting — Humboldt Universität zu Berlin, Deutschland

We present the ground state (T=0) phase diagram of the 3D Kondo-lattice model. By using a moment conserving decoupling approach for the electronic self-energy we have calculated the inner energies of different phases explicitly. The phase diagram is then constructed by comparing the energies for the different phases. For low coupling J we find that depending on the band filling different anti-ferromagnetic configurations are favored. For larger J ferromagnetism is favored except for the half-filled band case. Furthermore, regions of phase-separation are determined by an explicit Maxwell construction.