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Anomalous correlation effects and unique phase diagram of electron-doped FeSe revealed by photoemission spectroscopy

Author

Listed:
  • C. H. P. Wen

    (State Key Laboratory of Surface Physics, Fudan University)

  • H. C. Xu

    (State Key Laboratory of Surface Physics, Fudan University)

  • C. Chen

    (State Key Laboratory of Surface Physics, Fudan University)

  • Z. C. Huang

    (State Key Laboratory of Surface Physics, Fudan University)

  • X. Lou

    (State Key Laboratory of Surface Physics, Fudan University)

  • Y. J. Pu

    (State Key Laboratory of Surface Physics, Fudan University)

  • Q. Song

    (State Key Laboratory of Surface Physics, Fudan University)

  • B. P. Xie

    (State Key Laboratory of Surface Physics, Fudan University)

  • Mahmoud Abdel-Hafiez

    (Institute of Physics, Goethe University Frankfurt
    Center for High Pressure Science and Technology Advanced Research)

  • D. A. Chareev

    (Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, 119991 Moscow , Russia)

  • A. N. Vasiliev

    (M.V. Lomonosov Moscow State University)

  • R. Peng

    (State Key Laboratory of Surface Physics, Fudan University)

  • D. L. Feng

    (State Key Laboratory of Surface Physics, Fudan University)

Abstract

FeSe layer-based superconductors exhibit exotic and distinctive properties. The undoped FeSe shows nematicity and superconductivity, while the heavily electron-doped KxFe2−ySe2 and single-layer FeSe/SrTiO3 possess high superconducting transition temperatures that pose theoretical challenges. However, a comprehensive study on the doping dependence of an FeSe layer-based superconductor is still lacking due to the lack of a clean means of doping control. Through angle-resolved photoemission spectroscopy studies on K-dosed thick FeSe films and FeSe0.93S0.07 bulk crystals, here we reveal the internal connections between these two types of FeSe-based superconductors, and obtain superconductivity below ∼46 K in an FeSe layer under electron doping without interfacial effects. Moreover, we discover an exotic phase diagram of FeSe with electron doping, including a nematic phase, a superconducting dome, a correlation-driven insulating phase and a metallic phase. Such an anomalous phase diagram unveils the remarkable complexity, and highlights the importance of correlations in FeSe layer-based superconductors.

Suggested Citation

  • C. H. P. Wen & H. C. Xu & C. Chen & Z. C. Huang & X. Lou & Y. J. Pu & Q. Song & B. P. Xie & Mahmoud Abdel-Hafiez & D. A. Chareev & A. N. Vasiliev & R. Peng & D. L. Feng, 2016. "Anomalous correlation effects and unique phase diagram of electron-doped FeSe revealed by photoemission spectroscopy," Nature Communications, Nature, vol. 7(1), pages 1-7, April.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms10840
    DOI: 10.1038/ncomms10840
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