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

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.

SUBMITTER: Sun JP 

PROVIDER: S-EPMC5785538 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature

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Reemergence of high-T<sub>c</sub> superconductivity in the (Li<sub>1-x</sub>Fe <sub>x</sub> )OHFe<sub>1-y</sub>Se under high pressure.

Sun J P JP   Shahi P P   Zhou H X HX   Huang Y L YL   Chen K Y KY   Wang B S BS   Ni S L SL   Li N N NN   Zhang K K   Yang W G WG   Uwatoko Y Y   Xing G G   Sun J J   Singh D J DJ   Jin K K   Zhou F F   Zhang G M GM   Dong X L XL   Zhao Z X ZX   Cheng J-G JG  

Nature communications 20180125 1

In order to elucidate pressure-induced second superconducting phase (SC-II) in A <sub>x</sub> Fe<sub>2-y</sub>Se<sub>2</sub> (A = K, Rb, Cs, and Tl) having an intrinsic phase separation, we perform a detailed high-pressure magnetotransport study on the isoelectronic, phase-pure (Li<sub>1-x</sub>Fe <sub>x</sub> )OHFe<sub>1-y</sub>Se single crystals. Here we show that its ambient-pressure superconducting phase (SC-I) with a critical temperature T<sub>c</sub> ≈ 40 K is suppressed gradually to below  ...[more]

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