p-Wave Superconductivity in Iron-based Superconductors

Abstract

The possibility of p-wave pairing in superconductors has been proposed more than five decades ago, but has not yet been convincingly demonstrated. One difficulty is that some p-wave states are thermodynamically indistinguishable from s-wave, while others are very similar to d-wave states. Here we studied the self-field critical current of NdFeAs(O,F) thin films in order to extract absolute values of the London penetration depth, the superconducting energy gap, and the relative jump in specific heat at the superconducting transition temperature, and find that all the deduced physical parameters strongly indicate that NdFeAs(O,F) is a bulk p-wave superconductor. Further investigation revealed that single atomic layer FeSe also shows p-wave pairing. In an attempt to generalize these findings, we re-examined the whole inventory of superfluid density measurements in iron-based superconductors show quite generally that most of the iron-based superconductors are p-wave superconductors.

arXiv comment35 pages, 15 figures

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Cited by in corpus (8)

• Theory of Majorana zero modes in unconventional superconductors
• Classifying superconductivity in Moiré graphene superlattices
• Classifying superconductivity in an infinite-layer nickelate Nd${}_{0.8}$Sr${}_{0.2}$NiO${}_2$
• Signatures of Majorana bound states and parity effects in two-dimensional chiral p-wave Josephson junctions
• Classifying superconductivity in ThH-ThD superhydrides/superdeuterides
• New scaling laws for pinning force density in superconductors
• Majorana excitons in a Kitaev chain of semiconductor quantum dots in a nanowire
• In-plane p-wave coherence length in iron-based superconductors