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

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• Transition from sign-reversed to sign-preserved Cooper-pairing symmetry in sulfur-doped iron selenide superconductors
• Pairing Mechanism of the Heavily Electron Doped FeSe Systems: Dynamical Tuning of the Pairing Cutoff Energy
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• Exploring of point-contact spectra of Ba1-xNaxFe2As2 in the normal and superconducting state
• Weak-coupling superconductivity in a strongly correlated iron pnictide
• Details of the disorder-induced transition between $s_{\pm }$ and $s_{++}$ states in two-band model for Fe-based superconductors
• Time-reversal symmetry breaking state in dirty three-band superconductor
• Cooper instability generated by attractive fermion-fermion interaction in the two-dimensional semi-Dirac semimetals
• Spin Current in Junctions composed of Multi-band Superconductors with a Spin-density Wave
• Single 20meV boson mode in KFe2As2 detected by point-contact spectroscopy
• Quasiparticle interference in multiband superconductors with strong coupling
• Impurity effects on spin dynamics in magnetic and superconducting iron pnictides and chalcogenides
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• Decisive proofs of the $s_{\pm }\to s_{++}$ transition in the temperature dependence of the magnetic penetration depth
• Coupled multiple-mode theory for $s_{\pm }$ pairing mechanism in iron based superconductors