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TT: Fachverband Tiefe Temperaturen

TT 36: Superconductivity: Fe-based Superconductors - Fe(Se,Te), LiFeAs, and other Materials

TT 36.9: Vortrag

Mittwoch, 13. März 2013, 11:45–12:00, H18

Iron Chalcogenides: Correlated Materials far from Mott — •Markus Aichhorn¹, Gianluca Giovannetti², Massimo Capone², and Christoph Heil¹ — ¹Institut für theoretische Physik - Computational Physics, TU Graz, Austria — ²SISSA, Trieste, Italy

Combining density-functional theory and dynamical mean-field theory we investigate the ground-state of iron-chalcogenide materials, focusing on the materials KFe₂Se₂ and K₂Fe₄Se₅. We show that, although having large substantial mass enhancements and scattering rates, these materials are not close to a Mott Metal-To-Insulator transition. However, increasing interaction parameters in a physically reasonable range does lead to enhanced orbital differentiation. From RPA susceptibility calculations we get further evidence that also superconducting pairing is mediated by local spin-fluctuations, and not by Fermi-nesting mechanisms.