Manifestation of impurity induced s_{+-} -> s_{++} transition: multiband model for dynamical response functions

Abstract

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.

14 pages, 6 figures

References in corpus (3)

• NMR relaxation rate in superconducting pnictides: extended $s_{\pm }$ scenario
• Superfluid density and specific heat within self-consistent scheme for two-band superconductor
• Impurity Effects in Sign Reversing Fully-Gapped Superconductors: Analysis of FeAs Superconductors