Reemergence of high-T superconductivity in the (LiFe )OHFeSe under high pressure.
NATURE COMMUNICATIONS(2018)
摘要
In order to elucidate pressure-induced second superconducting phase (SC-II) in A(x)Fe(2-)ySe(2) (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-xFex)OHFe1-ySe single crystals. Here we show that its ambient-pressure superconducting phase (SC-I) with a critical temperature T-c approximate to 40 K is suppressed gradually to below 2 K and an SC-II phase emerges above P-c approximate to 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.
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关键词
Electronic properties and materials,Superconducting properties and materials,Science,Humanities and Social Sciences,multidisciplinary
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