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TT: Fachverband Tiefe Temperaturen

TT 9: SC: Poster Session

TT 9.30: Poster

Montag, 22. März 2010, 14:00–18:00, Poster A

Possible Mechanism of Small Magnetic Moment in Iron Pnictides — Hunpyo Lee, •Yu-Zhong Zhang, Harald Jeschke, and Roser Valenti — Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany

The experimentally observed small iron magnetic moment in undoped iron pnictides at low temperatures is still not well understood. We propose that the interplay between frustrated and non-frustrated bands could be the origin for the antiferromagnetic metallic state with small magnetization. Our theory is free of assumptions, like, negative U, effective pressure or localization. The proposal is verified by using dynamical mean field theory combined with the continuous time quantum Monte Carlo method to solve a two-band frustrated Hubbard model without artificially ignoring the antiferromagnetic solution. Furthermore, interesting phenomena, like orbital selective metal-to-insulator transitions, are carefully investigated.