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Observation of strong electron pairing on bands without Fermi surfaces in LiFe1−xCoxAs

Author

Listed:
  • H. Miao

    (Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • T. Qian

    (Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • X. Shi

    (Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • P. Richard

    (Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
    Collaborative Innovation Center of Quantum Matter)

  • T. K. Kim

    (Diamond Light Source, Harwell Campus)

  • M. Hoesch

    (Diamond Light Source, Harwell Campus)

  • L. Y. Xing

    (Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • X.-C. Wang

    (Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • C.-Q. Jin

    (Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
    Collaborative Innovation Center of Quantum Matter)

  • J.-P. Hu

    (Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
    Collaborative Innovation Center of Quantum Matter
    Purdue University)

  • H. Ding

    (Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
    Collaborative Innovation Center of Quantum Matter)

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.

Suggested Citation

  • H. Miao & T. Qian & X. Shi & P. Richard & T. K. Kim & M. Hoesch & L. Y. Xing & X.-C. Wang & C.-Q. Jin & J.-P. Hu & H. Ding, 2015. "Observation of strong electron pairing on bands without Fermi surfaces in LiFe1−xCoxAs," Nature Communications, Nature, vol. 6(1), pages 1-6, May.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7056
    DOI: 10.1038/ncomms7056
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    Cited by:

    1. Hemian Yi & Lun-Hui Hu & Yi-Fan Zhao & Ling-Jie Zhou & Zi-Jie Yan & Ruoxi Zhang & Wei Yuan & Zihao Wang & Ke Wang & Danielle Reifsnyder Hickey & Anthony R. Richardella & John Singleton & Laurel E. Win, 2023. "Dirac-fermion-assisted interfacial superconductivity in epitaxial topological-insulator/iron-chalcogenide heterostructures," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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