Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 69: Superconductivity: Fe-based Superconductors - Theory

TT 69.8: Talk

Friday, March 15, 2013, 11:30–11:45, H21

Breaking of fourfold lattice symmetry in a model for pnictide superconductors — Maria Daghofer and •Andre Fischer — IFW Dresden, Dresden, Germany

We investigate the interplay of onsite Coulomb repulsion and various mechanisms breaking the fourfold lattice symmetry in a three-band model for the iron planes of iron-based superconductors using cluster perturbation theory[1]. Previously investigated anisotropic magnetic couplings are compared to an orbital ordering field and anisotropic hoppings. We find that all three mechanisms lead to similar signatures once the onsite interactions are strong enough to bring the system close to a spin-density wave state.
[1] M. Daghofer and A. Fischer, Supercond. Sci. Technol. 25, 084003 (2012)