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• W2140755281 abstract "In conventional BCS superconductors, the quantum condensation of superconducting electron pairs is understood as a Fermi surface instability, in which the low-energy electrons are paired by attractive interactions. Whether this explanation is still valid in high-Tc superconductors such as cuprates and iron-based superconductors remains an open question. In particular, a fundamentally different picture of the electron pairs, which are believed to be formed locally by repulsive interactions, may prevail. Here we report a high-resolution angle-resolved photoemission spectroscopy study on LiFe1−xCoxAs. We reveal a large and robust superconducting gap on a band sinking below the Fermi level on Co substitution. The observed Fermi-surface-free superconducting order is also the largest over the momentum space, which rules out a proximity effect origin and indicates that the order parameter is not tied to the Fermi surface as a result of a surface instability. It remains to be seen if high-Tc superconductors rely on similar Fermi-surface instabilities as their BCS counterparts. Miao et al. study the high-Tc compound LiFe1−xCoxAs with high-resolution ARPES and find a robust gap with Co doping that suggests the order parameter is not tied to such instabilities." @default.
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• W2140755281 date "2015-01-13" @default.
• W2140755281 modified "2023-09-26" @default.
• W2140755281 title "Observation of strong electron pairing on bands without Fermi surfaces in LiFe1−xCoxAs" @default.
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• W2140755281 doi "https://doi.org/10.1038/ncomms7056" @default.
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