Microwave response of superconducting pnictides: extended $s_{\pm }$ scenario

Abstract

We consider a two-band superconductor with relative phase $\pi$ between the two order parameters as a model for the superconducting state in ferropnictides. Within this model we calculate the microwave response and the NMR relaxation rate. The influence of intra- and interband impurity scattering beyond the Born and unitary limits is taken into account. We show that, depending on the scattering rate, various types of power law temperature dependencies of the magnetic field penetration depth and the NMR relaxation rate at low temperatures may take place.

11 pages, 5 figures

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Cited by in corpus (11)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• London Penetration Depth in Iron - based Superconductors
• Momentum dependence and nodes of the superconducting gap in iron-pnictides
• Enhancement of $T_c$ by disorder in underdoped iron pnictides
• Phase diagram of iron-pnictides if doping acts as a disorder
• Highly anisotropic energy gap in superconducting Ba(Fe${}_{0.9}$Co${}_{0.1}$)${}_2$As${}_2$ from optical conductivity measurements
• Small anisotropy of the lower critical field and $s_{\pm }$-wave two-gap feature in single crystal LiFeAs
• Comprehensive Eliashberg analysis of microwave conductivity and penetration depth of K-, Co-, and P-substituted BaFe2As2
• Observation of a coherence peak and pair-breaking effects in THz conductivity of BaFe${}_{2-2x}$Co${}_{2x}$As${}_2$
• Effect of Quasiparticles Injection on the AC Response of a Superconductor
• Interband coupling and transport interband scattering in $s_{\pm }$ superconductors