Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 24: Postersitzung III: Korrelierte Elektronen, ”Orbital Physics”
TT 24.11: Poster
Mittwoch, 10. März 2004, 14:30–19:00, Poster A
Coexistence of s-wave Superconductivity and Antiferromagnetism — •Martin Feldbacher1, Fakher Assaad2, Frederic Hébert3, and George Batrouni3 — 1Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart — 2Universität Würzburg, Institut für Theoretische Physik I, Am Hubland, 97074 Würzburg — 3Institut Non-Linéaire de Nice, Université de Nice-Sophia Antipolis, France
We study the phase diagram of a new model that exhibits a first order transition between s-wave superconducting and antiferromagnetic phases. The model, a generalized Hubbard model augmented with competing spin-spin and pair-pair interactions, was investigated using the projector Quantum Monte Carlo method. Upon varying the Hubbard U from attractive to repulsive we find a first order phase transition between superconducting and antiferromagnetic states. Phys. Rev. Lett., 91:056401, 2003