Berlin 2008 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 32: Correlated Electrons: Poster Session
TT 32.82: Poster
Thursday, February 28, 2008, 14:00–18:00, Poster B
Valence transition in the periodic Anderson model in the presence of a Coulomb repulsion between f- and conduction electrons — •Nham Phan Van, Alexander Mai, and Klaus W. Becker — Institut für Theoretische Physik, TU Dresden, Germany
The extended periodic Anderson model with a Coulomb repulsion Ufc between localized f and conduction electrons has been investigated by use of the Projector-based renormalization method (PRM). As function of the f-level energy εf a transition from an integer f-valence at low εf to a mixed valent behavior at higher εf is found. For fixed total electron number the transition becomes sharper if Ufc is increased. According to literature a sharp valence transition should be accompanied by the occurence of a superconducting phase.