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TT: Tiefe Temperaturen

TT 25: Correlated Electrons - Poster Session

TT 25.53: Poster

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

Low-temperature phase diagram of the two-orbital Hubbard model — •Robert Peters and Thomas Pruschke — Institut für Theoretische Physik, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

We study the two-orbital Hubbard model by means of the dynamical mean-field theory using Wilson’s numerical renormalization group to solve the effective impurity. As additional degree of freedom we include a localized spin coupled via Hund’s exchange to the two orbitals, as e.g. necessary to properly describe La_1−xCa_xMnO₃.

We investigate ferro-, antiferromagnetic and orbital order and their interplay as function of local Coulomb interaction parameters, filling and the additional localized spin degree of freedom. Comparison to generic features of the phase diagram of La_1−xCa_xMnO₃ will be made.