Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 32: Correlated Electrons: Poster Session

TT 32.81: Poster

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

Valence transition in the periodic Anderson model — •Alexander Mai, Nham Phan Van, and Klaus W. Becker — Institut für Theoretische Physik, TU Dresden, Germany

The origin of a possible quantum valence transition in the periodic Anderson model has been discussed controversially over the last years. Using an extension of the Projector-based Renormalization Method (PRM) to a continuous renormalization technique (CPRM) we try to merge the different points of view into one. We show that for fixed particle density the transition is smooth with a small slope in systems with small orbital degeneracy, whereas it becomes rather steep for large degeneracies. In contrast, for fixed chemical potential we find a rather abrupt change as function of the f-electron energy. The discussion is completed by an outlook on a possible superconducting phase in the PAM.