Reemergence of high-Tc superconductivity in the (Li1-xFe x )OHFe1-ySe under high pressure

J. P. Sun, P. Shahi, H. X. Zhou, Y. L. Huang, K. Y. Chen, B. S. Wang, S. L. Ni, N. N. Li, K. Zhang, W. G. Yang, Y. Uwatoko, G. Xing, J. Sun, D. J. Singh, K. Jin, F. Zhou, G. M. Zhang, X. L. Dong (), Z. X. Zhao and J.-G. Cheng ()
Additional contact information
J. P. Sun: Chinese Academy of Sciences
P. Shahi: Chinese Academy of Sciences
H. X. Zhou: Chinese Academy of Sciences
Y. L. Huang: Chinese Academy of Sciences
K. Y. Chen: Chinese Academy of Sciences
B. S. Wang: Chinese Academy of Sciences
S. L. Ni: Chinese Academy of Sciences
N. N. Li: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
K. Zhang: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
W. G. Yang: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Y. Uwatoko: University of Tokyo
G. Xing: University of Missouri
J. Sun: University of Missouri
D. J. Singh: University of Missouri
K. Jin: Chinese Academy of Sciences
F. Zhou: Chinese Academy of Sciences
G. M. Zhang: Tsinghua University
X. L. Dong: Chinese Academy of Sciences
Z. X. Zhao: Chinese Academy of Sciences
J.-G. Cheng: Chinese Academy of Sciences

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract In order to elucidate pressure-induced second superconducting phase (SC-II) in A x Fe2−ySe2 (A = K, Rb, Cs, and Tl) having an intrinsic phase separation, we perform a detailed high-pressure magnetotransport study on the isoelectronic, phase-pure (Li1−xFe x )OHFe1−ySe single crystals. Here we show that its ambient-pressure superconducting phase (SC-I) with a critical temperature Tc ≈ 40 K is suppressed gradually to below 2 K and an SC-II phase emerges above Pc ≈ 5 GPa with Tc increasing progressively to above 50 K up to 12.5 GPa. Our high-precision resistivity data uncover a sharp transition of the normal state from Fermi liquid for SC-I to non-Fermi liquid for SC-II phase. In addition, the reemergence of high-Tc SC-II is found to accompany with a concurrent enhancement of electron carrier density. Without structural transition below 10 GPa, the observed SC-II with enhanced carrier density should be ascribed to an electronic origin presumably associated with pressure-induced Fermi surface reconstruction.

Date: 2018
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DOI: 10.1038/s41467-018-02843-7

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