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Dichotomy of the electronic structure and superconductivity between single-layer and double-layer FeSe/SrTiO3 films

Author

Listed:
  • Xu Liu

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

  • Defa Liu

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

  • Wenhao Zhang

    (State Key Lab of Low-Dimensional Quantum Physics, Tsinghua University
    Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • Junfeng He

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

  • Lin Zhao

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

  • Shaolong He

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

  • Daixiang Mou

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

  • Fangsen Li

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

  • Chenjia Tang

    (State Key Lab of Low-Dimensional Quantum Physics, Tsinghua University
    Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • Zhi Li

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

  • Lili Wang

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

  • Yingying Peng

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

  • Yan Liu

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

  • Chaoyu Chen

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

  • Li Yu

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

  • Guodong Liu

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

  • Xiaoli Dong

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

  • Jun Zhang

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

  • Chuangtian Chen

    (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)

  • Zuyan Xu

    (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)

  • Xi Chen

    (State Key Lab of Low-Dimensional Quantum Physics, Tsinghua University)

  • Xucun Ma

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

  • Qikun Xue

    (State Key Lab of Low-Dimensional Quantum Physics, Tsinghua University)

  • X. J. Zhou

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

Abstract

The latest discovery of possible high-temperature superconductivity in the single-layer FeSe film grown on a SrTiO3 substrate has generated much attention. Initial work found that, while the single-layer FeSe/SrTiO3 film exhibits a clear signature of superconductivity, the double-layer film shows an insulating behaviour. Such a marked layer-dependent difference is surprising and the underlying origin remains unclear. Here we report a comparative angle-resolved photoemission study between the single-layer and double-layer FeSe/SrTiO3 films annealed in vacuum. We find that, different from the single-layer FeSe/SrTiO3 film, the double-layer FeSe/SrTiO3 film is hard to get doped and remains in the semiconducting/insulating state under an extensive annealing condition. Such a behaviour originates from the much reduced doping efficiency in the bottom FeSe layer of the double-layer FeSe/SrTiO3 film from the FeSe–SrTiO3 interface. These observations provide key insights in understanding the doping mechanism and the origin of superconductivity in the FeSe/SrTiO3 films.

Suggested Citation

  • Xu Liu & Defa Liu & Wenhao Zhang & Junfeng He & Lin Zhao & Shaolong He & Daixiang Mou & Fangsen Li & Chenjia Tang & Zhi Li & Lili Wang & Yingying Peng & Yan Liu & Chaoyu Chen & Li Yu & Guodong Liu & X, 2014. "Dichotomy of the electronic structure and superconductivity between single-layer and double-layer FeSe/SrTiO3 films," Nature Communications, Nature, vol. 5(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6047
    DOI: 10.1038/ncomms6047
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