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Spectroscopic evidence of superconductivity pairing at 83 K in single-layer FeSe/SrTiO3 films

Author

Listed:
  • Yu Xu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Hongtao Rong

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Qingyan Wang

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Dingsong Wu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Yong Hu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Yongqing Cai

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Qiang Gao

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Hongtao Yan

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Cong Li

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Chaohui Yin

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Hao Chen

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Jianwei Huang

    (Chinese Academy of Sciences)

  • Zhihai Zhu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Yuan Huang

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Guodong Liu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    Songshan Lake Materials Laboratory)

  • Zuyan Xu

    (Chinese Academy of Sciences)

  • Lin Zhao

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    Songshan Lake Materials Laboratory)

  • X. J. Zhou

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    Songshan Lake Materials Laboratory
    Beijing Academy of Quantum Information Sciences)

Abstract

Single-layer FeSe films grown on the SrTiO3 substrate (FeSe/STO) have attracted much attention because of their possible record-high superconducting critical temperature (Tc) and distinct electronic structures. However, it has been under debate on how high its Tc can really reach due to the inconsistency of the results from different measurements. Here we report spectroscopic evidence of superconductivity pairing at 83 K in single-layer FeSe/STO films. By preparing high-quality single-layer FeSe/STO films, we observe strong superconductivity-induced Bogoliubov back-bending bands that extend to rather high binding energy ~ 100 meV by high-resolution angle-resolved photoemission measurements. They provide a new definitive benchmark of superconductivity pairing that is directly observed up to 83 K. Moreover, we find that the pairing state can be further divided into two temperature regions. These results indicate that either Tc as high as 83 K is achievable, or there is a pseudogap formation from superconductivity fluctuation in single-layer FeSe/STO films.

Suggested Citation

  • Yu Xu & Hongtao Rong & Qingyan Wang & Dingsong Wu & Yong Hu & Yongqing Cai & Qiang Gao & Hongtao Yan & Cong Li & Chaohui Yin & Hao Chen & Jianwei Huang & Zhihai Zhu & Yuan Huang & Guodong Liu & Zuyan , 2021. "Spectroscopic evidence of superconductivity pairing at 83 K in single-layer FeSe/SrTiO3 films," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-23106-y
    DOI: 10.1038/s41467-021-23106-y
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    Cited by:

    1. Jordyn Hales & Utkarsh Bajpai & Tongtong Liu & Denitsa R. Baykusheva & Mingda Li & Matteo Mitrano & Yao Wang, 2023. "Witnessing light-driven entanglement using time-resolved resonant inelastic X-ray scattering," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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