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Superconductivity below 20 K in heavily electron-doped surface layer of FeSe bulk crystal

Author

Listed:
  • J. J. Seo

    (Institute of Physics and Applied Physics, Yonsei University
    Center for Correlated Electron Systems, Institute for Basic Science)

  • B. Y. Kim

    (Pohang University of Science and Technology
    Advanced Light Source, Lawrence Berkeley National Laboratory)

  • B. S. Kim

    (Center for Correlated Electron Systems, Institute for Basic Science
    Seoul National University)

  • J. K. Jeong

    (Institute of Physics and Applied Physics, Yonsei University)

  • J. M. Ok

    (Pohang University of Science and Technology)

  • Jun Sung Kim

    (Pohang University of Science and Technology)

  • J. D. Denlinger

    (Advanced Light Source, Lawrence Berkeley National Laboratory)

  • S. -K. Mo

    (Advanced Light Source, Lawrence Berkeley National Laboratory)

  • C. Kim

    (Center for Correlated Electron Systems, Institute for Basic Science
    Seoul National University)

  • Y. K. Kim

    (Center for Correlated Electron Systems, Institute for Basic Science
    Advanced Light Source, Lawrence Berkeley National Laboratory
    Seoul National University)

Abstract

A superconducting transition temperature (Tc) as high as 100 K was recently discovered in one monolayer FeSe grown on SrTiO3. The discovery ignited efforts to identify the mechanism for the markedly enhanced Tc from its bulk value of 8 K. There are two main views about the origin of the Tc enhancement: interfacial effects and/or excess electrons with strong electron correlation. Here, we report the observation of superconductivity below 20 K in surface electron-doped bulk FeSe. The doped surface layer possesses all the key spectroscopic aspects of the monolayer FeSe on SrTiO3. Without interfacial effects, the surface layer state has a moderate Tc of 20 K with a smaller gap opening of 4.2 meV. Our results show that excess electrons with strong correlation cannot induce the maximum Tc, which in turn reveals the need for interfacial effects to achieve the highest Tc in one monolayer FeSe on SrTiO3.

Suggested Citation

  • J. J. Seo & B. Y. Kim & B. S. Kim & J. K. Jeong & J. M. Ok & Jun Sung Kim & J. D. Denlinger & S. -K. Mo & C. Kim & Y. K. Kim, 2016. "Superconductivity below 20 K in heavily electron-doped surface layer of FeSe bulk crystal," Nature Communications, Nature, vol. 7(1), pages 1-5, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11116
    DOI: 10.1038/ncomms11116
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