Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Postersession Correlated Electrons: (General) Theory, Low-Dimensional Systems, Kondo Physics, Heavy Fermions, Quantum-Critical Phenomena
TT 6.8: Poster
Montag, 23. März 2009, 13:00–16:45, P1A
Superconductivity in the two-dimensional extended periodic Anderson model — •Nham Phan Van1,2 and Klaus W Becker1 — 1Institut für Theoretische Physik, Technische Universität Dresden, D-01062 Dresden, Germany — 2Max-Planck Institut für Physik komplexer Systeme, D-01187 Dresden, Germany
The two-dimensional periodic Anderson model with an additional local Coulomb repulsion Ufc between localized f and conduction electrons is investigated by the use of the projector-based renormalization method. When the f-level energy єf is close to the Fermi level, the valence transition becomes sharper by increasing Ufc. We start from an Hamiltonian which includes small gauge symmetry breaking fields and derive self-consistent equations for the order parameters. Our numerical results show that the d-wave superconducting order is dominant close to the sharp valence transition regime. This affirms that the valence fluctuations might lead to superconductivity in the Ce based heavy-fermion systems under high pressure.