Spontaneous appearance of nonzero-momentum Cooper pairing: Possible application to the iron-pnictides

Michał Zegrodnik; Jozef Spałek

doi:10.1103/PhysRevB.90.174507

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Spontaneous appearance of nonzero-momentum Cooper pairing: Possible application to the iron-pnictides

Michał Zegrodnik, Jozef Spałek

DOI 10.1103/PhysRevB.90.174507 · Physical Review B

T1

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Abstract

We suggest that an inhomogeneous (nonzero-momentum) paired phase can appear in the absence of an external magnetic field in a system with a predominant interband pairing and with separate Fermi-surface sheets. The Fermi wave vector mismatch which appears in such a situation can be compensated by nonzero center-of-mass momentum of the Cooper pairs, which can lead to a spontaneous appearance of the Fulde-Ferrell type of superconducting state. The idea is examined using a tight-binding model which emulates the holelike and the electronlike bands of iron-based superconductors. The state can appear for the cases of both spin-singlet and spin-triplet pairing channels.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown