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

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 non...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-11, Vol.90 (17), Article 174507
Main Authors: Zegrodnik, Michał, Spałek, Jozef
Format: Article
Language:English
Subjects:
Bands
Channels
Condensed matter
Cooper pairs
Magnetic fields
Spontaneous
Superconductivity
Superconductors
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Summary: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.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.90.174507