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Scrutinizing the double superconducting gaps and strong coupling pairing in (Li1−xFex)OHFeSe

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  • Zengyi Du

    (Center for Superconducting Physics and Materials, Collaborative Innovation Center for Advanced Microstructures, Nanjing University)

  • Xiong Yang

    (Center for Superconducting Physics and Materials, Collaborative Innovation Center for Advanced Microstructures, Nanjing University)

  • Hai Lin

    (Center for Superconducting Physics and Materials, Collaborative Innovation Center for Advanced Microstructures, Nanjing University)

  • Delong Fang

    (Center for Superconducting Physics and Materials, Collaborative Innovation Center for Advanced Microstructures, Nanjing University)

  • Guan Du

    (Center for Superconducting Physics and Materials, Collaborative Innovation Center for Advanced Microstructures, Nanjing University)

  • Jie Xing

    (Center for Superconducting Physics and Materials, Collaborative Innovation Center for Advanced Microstructures, Nanjing University)

  • Huan Yang

    (Center for Superconducting Physics and Materials, Collaborative Innovation Center for Advanced Microstructures, Nanjing University)

  • Xiyu Zhu

    (Center for Superconducting Physics and Materials, Collaborative Innovation Center for Advanced Microstructures, Nanjing University)

  • Hai-Hu Wen

    (Center for Superconducting Physics and Materials, Collaborative Innovation Center for Advanced Microstructures, Nanjing University)

Abstract

In the field of iron-based superconductors, one of the frontier studies is about the pairing mechanism. The recently discovered (Li1−xFex)OHFeSe superconductor with the transition temperature of about 40 K provides a good platform to check the origin of double superconducting gaps and high transition temperature in the monolayer FeSe thin film. Here we report a scanning tunnelling spectroscopy study on the (Li1−xFex)OHFeSe single crystals. The tunnelling spectrum mimics that of the monolayer FeSe thin film and shows double gaps at about 14.3 and 8.6 meV. Further analysis based on the quasiparticle interference allows us to rule out the d-wave gap, and for the first time assign the larger (smaller) gap to the outer (inner) Fermi pockets (after folding) associating with the dxy (dxz/dyz) orbitals, respectively. The gap ratio amounts to 8.7, which demonstrates the strong coupling mechanism in the present superconducting system.

Suggested Citation

  • Zengyi Du & Xiong Yang & Hai Lin & Delong Fang & Guan Du & Jie Xing & Huan Yang & Xiyu Zhu & Hai-Hu Wen, 2016. "Scrutinizing the double superconducting gaps and strong coupling pairing in (Li1−xFex)OHFeSe," Nature Communications, Nature, vol. 7(1), pages 1-8, April.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms10565
    DOI: 10.1038/ncomms10565
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    Cited by:

    1. Qiang Gao & Jin Mo Bok & Ping Ai & Jing Liu & Hongtao Yan & Xiangyu Luo & Yongqing Cai & Cong Li & Yang Wang & Chaohui Yin & Hao Chen & Genda Gu & Fengfeng Zhang & Feng Yang & Shenjin Zhang & Qinjun P, 2024. "ARPES detection of superconducting gap sign in unconventional superconductors," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    2. Ziyuan Chen & Dong Li & Zouyouwei Lu & Yue Liu & Jiakang Zhang & Yuanji Li & Ruotong Yin & Mingzhe Li & Tong Zhang & Xiaoli Dong & Ya-Jun Yan & Dong-Lai Feng, 2023. "Charge order driven by multiple-Q spin fluctuations in heavily electron-doped iron selenide superconductors," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    3. Zhongxu Wei & Shengshan Qin & Cui Ding & Xianxin Wu & Jiangping Hu & Yu-Jie Sun & Lili Wang & Qi-Kun Xue, 2023. "Identifying s-wave pairing symmetry in single-layer FeSe from topologically trivial edge states," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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