Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 110: Superconductivity: Fe-based Superconductors – Theory
TT 110.5: Talk
Friday, March 20, 2015, 10:30–10:45, H 2053
Pair-breaking due to orbital magnetism in iron-based superconductors — •Mareike Hoyer1,2, Mathias S. Scheurer1, Sergey V. Syzranov3,1, and Jörg Schmalian1,2 — 1Institut für Theorie der Kondensierten Materie, Karlsruher Institut für Technologie, Karlsruhe, Germany — 2Institut für Festkörperphysik, Karlsruher Institut für Technologie, Karlsruhe, Germany — 3Department of Physics, University of Boulder, Boulder, Colorado, USA
We consider superconductivity in the presence of impurities in a two-band model suited for the description of iron-based superconductors. We analyze the effect of interband scattering processes on superconductivity, allowing for orbital, i. e., non-spin-magnetic time-reversal-symmetry-breaking impurities. Pair-breaking in such systems is described by a nontrivial phase in an interband-scattering matrix element. We find that the transition temperature of conventional superconductors can be suppressed due to interband scattering, whereas unconventional superconductors may be unaffected. As an example, we consider impurities associated with orbital density waves that are of interest for iron-based superconductors.