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

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 () and D. L. Feng ()
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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
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

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms10840

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