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TT: Fachverband Tiefe Temperaturen
TT 40: Superconductivity: Ferropnictides 1
TT 40.3: Talk
Thursday, March 26, 2009, 14:30–14:45, HSZ 03
Functional renormalization group study of the iron pnictides — •Christian Platt, Carsten Honerkamp, and Werner Hanke — Institute for Theoretical Physics and Astrophysics, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
Recently, a new class of superconductors (sc) - Fe-based sc - was discovered. These sc iron pnictides are most likely less correlated than the high-Tc cuprates but present again a challenging case of competing magnetic and superconducting orders at low temperatures. Therefore, perturbative functional renormalization group (fRG) methods appear adequate for the theoretical modelling of the phase diagram. Here, we apply the fRG to a four-band (Fe-d-orbital) model including intra- and interband couplings as well as interband pair hoppings. We compute the leading instabilities, i.e. spin-ordered phase in the "underdoped" situation and the leading pairing instability as a function of the electron density and interaction parameters.