Enhanced superconductivity accompanying a Lifshitz transition in electron-doped FeSe monolayer

X. Shi, Han Z-Q, Peng X-L, P. Richard, T. Qian, Wu X-X, Qiu M-W, S. C. Wang, J. P. Hu, Sun Y-J () and H. Ding ()
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X. Shi: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Han Z-Q: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Peng X-L: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
P. Richard: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
T. Qian: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Wu X-X: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Qiu M-W: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
S. C. Wang: Beijing Key Laboratory of Opto-Electronic Functional Materials and Micro-nano Devices, Renmin University of China
J. P. Hu: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Sun Y-J: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
H. Ding: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract The origin of enhanced superconductivity over 50 K in the recently discovered FeSe monolayer films grown on SrTiO3 (STO), as compared to 8 K in bulk FeSe, is intensely debated. As with the ferrochalcogenides AxFe2−ySe2 and potassium-doped FeSe, which also have a relatively high-superconducting critical temperature (Tc), the Fermi surface (FS) of the FeSe/STO monolayer films is free of hole-like FS, suggesting that a Lifshitz transition by which these hole FSs vanish may help increasing Tc. However, the fundamental reasons explaining this increase of Tc remain unclear. Here we report a 15 K jump of Tc accompanying a second Lifshitz transition characterized by the emergence of an electron pocket at the Brillouin zone centre, which is triggered by high-electron doping following in situ deposition of potassium on FeSe/STO monolayer films. Our results suggest that the pairing interactions are orbital dependent in generating enhanced superconductivity in FeSe.

Date: 2017
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DOI: 10.1038/ncomms14988

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