Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 69: Superconductivity: Fe-based Superconductors - Theory

TT 69.9: Talk

Friday, March 15, 2013, 11:45–12:00, H21

Emergence of superconductivity in the presence of a metallic spin density wave — •Jacob Schmiedt, Philip M. R. Brydon, and Carsten Timm — Institut für Theoretische Physik, TU Dresden, Germany

The coexistence of spin density wave (SDW) and superconducting (SC) order has gained significant attention in the field of iron pnictides since there is strong experimental evidence for microscopic coexistence in a number of compounds. Both types of order gap out the Fermi surface - at least partially. We study how the existence of a SDW gap influences the formation of the SC state and determines the preferred gap symmetry. In contrast to previous studies that use phenomenological pairing potentials, we take a more realistic approach of calculating the effective pairing interaction in the SDW background from the bare interactions using the random phase approximation. This scheme can also be applied to models with orbital degrees of freedom, which can lead to a deeper understanding of the coexistence and the interplay between SDW and SC order in multi-orbital systems such as the pnictides.