Multiple Gaps and Superfluid Density from Interband Pairing in Iron Oxypnictides

Abstract

We study a four-band model for the iron oxypnictides, in which the superconducting properties are assumed to be determined by the interband coupling between hole-like and electron-like Fermi sheets. We show that reasonable parameters can account for the angle-resolved photoemission spectra showing multiple gaps in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$, and for the temperature dependence of the superfluid density. At the same time, the zero-temperature value of the superfluid density shows a conventional scaling with the number of carriers.

4 pages, 3 figures

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• On the multi-orbital band structure and itinerant magnetism of iron-based superconductors
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• Theory of fluctuation conductivity from interband pairing in pnictide superconductors
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• A doping-dependent switch from one- to two-component superfluidity at temperature above 100K in coupled electron-hole Van der Waals heterostructures
• Interplay between magnetism and superconductivity and appearance of a second superconducting transition in alpha-FeSe at high pressure
• Superfluid density in the $s_{\pm }$-wave state of clean iron-based superconductors
• High-$T_c$ Berezinskii-Kosterlitz-Thouless transition in 2D superconducting systems with coupled deep and quasi-flat electronic bands with van Hove singularities
• Gap-dependent quasiparticle dynamics and coherent acoustic phonons in parent iron pnictide CaFe2As2 across the spin density wave phase transition
• Aligned crystallite powder of NdFeAsO${}_{0.86}$F${}_{0.14}$: magnetic hysteresis and penetration depth