Details

Autor(en) / Beteiligte

• Sun, J P
• Shahi, P
• Zhou, H X
• Huang, Y L
• Chen, K Y
• Wang, B S
• Ni, S L
• Li, N N
• Zhang, K
• Yang, W G
• Uwatoko, Y
• Xing, G
• Sun, J
• Singh, D J
• Jin, K
• Zhou, F
• Zhang, G M
• Dong, X L
• Zhao, Z X
• J-G, Cheng

Titel

Reemergence of high-T c superconductivity in the (Li1-x Fe x )OHFe1-y Se under high pressure

Ist Teil von

• Nature communications, 2018-12, Vol.9, p.1-7

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• In order to elucidate pressure-induced second superconducting phase (SC-II) in AxFe2−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−xFex)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.