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Paper detail

Cooper Pairing in Insulating Valence Band in Fe-Based Superconductors

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.

preprint2015arXivOpen access
Lun-Hui HuWei-Qiang ChenFu-chun Zhang
cond-mat.supr-concond-mat.str-el
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Lun-Hui HuWei-Qiang ChenFu-chun Zhang

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