Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 12: Poster Session Superconductivity

TT 12.27: Poster

Montag, 11. März 2013, 15:00–19:00, Poster D

Nodal spin density wave in iron-based superconductors — •Felix Ahn and Ilya M. Eremin — Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany

We analyze the competition of SDW and SC orders in the iron-based superconductors, taking into account the orbital matrix elements. We find that the SDW order necessarily possesses the nodal structure as a result of angular dependence of the Fermi-liquid interactions. To obtain the phase diagram we solve the system of coupled mean-field gap equations, which describes the competition between SDW and s++ or s+− superconductivity. We revisit the result, obtained previously, for the constant SDW gap. We further discuss the role played by the spin-orbit coupling.