Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 69: Superconductivity: Fe-based Superconductors - Theory

TT 69.7: Talk

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

Manifestations of impurity induced s_±→ s₊₊ transition: multiband model for dynamical response functions — •Dmitri Efremov¹, Oleg Dolgov², and Alexander Golubov³ — ¹IFW, Dresden — ²FKF, Stuttgart — ³University of Twente

We investigate effects of disorder on the density of states, the single particle response function and optical conductivity in multiband superconductors with s_± symmetry of the order parameter, where s₊₋ → s₊₊ transition may take place. In the vicinity of the transition the superconductive gapless regime is realized. It manifests itself in anomalies in the above mentioned properties. As a result, intrinsically phase-insensitive experimental methods like ARPES, tunneling and terahertz spectroscopy may be used for revealing of information about the underlying order parameter symmetry.