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Cooper Pairing in Insulating Valence Band in Fe-Based Superconductors

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arxiv 1502.04285 v1 pith:R54ONORA submitted 2015-02-15 cond-mat.supr-con cond-mat.str-el

Lun-Hui Hu , Wei-Qiang Chen , Fu-Chun Zhang This is my paper · ORCID
classification cond-mat.supr-concond-mat.str-el
keywords bandholepairingcooperinsulatinglifeassuperconductivityco-doped
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Conventional Cooper pairing arises from attractive interaction of electrons in the metallic bands. Recent experiment on Co-doped LiFeAs shows superconductivity in the insulating valence band, which is evolved from a metallic hole band upon doping. Here we examine this phenomenon by studying superconductivity in a three-orbital Hamiltonian relevant to the doped LiFeAs. We show explicitly that Cooper pairing of the insulating hole band requires a finite pairing interaction strength. For strong coupling, the superconductivity in the hole band is robust against the sink of the hole band below the Fermi level. Our theory predicts a substantial upward shift of the chemical potential in the superconducting transition for Co-doped LiFeAs.

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