MISC

2015年4月

Emergence of double-dome superconductivity in ammoniated metal-doped FeSe

SCIENTIFIC REPORTS
  • Masanari Izumi
  • ,
  • Lu Zheng
  • ,
  • Yusuke Sakai
  • ,
  • Hidenori Goto
  • ,
  • Masafumi Sakata
  • ,
  • Yuki Nakamoto
  • ,
  • Huyen L. T. Nguyen
  • ,
  • Tomoko Kagayama
  • ,
  • Katsuya Shimizu
  • ,
  • Shingo Araki
  • ,
  • Tatsuo C. Kobayashi
  • ,
  • Takashi Kambe
  • ,
  • Dachun Gu
  • ,
  • Jing Guo
  • ,
  • Jing Liu
  • ,
  • Yanchun Li
  • ,
  • Liling Sun
  • ,
  • Kosmas Prassides
  • ,
  • Yoshihiro Kubozono

5
開始ページ
9477-1-9477-7
終了ページ
記述言語
英語
掲載種別
DOI
10.1038/srep09477
出版者・発行元
NATURE PUBLISHING GROUP

The pressure dependence of the superconducting transition temperature (T-c) and unit cell metrics of tetragonal (NH3)(y)Cs0.4FeSe were investigated in high pressures up to 41 GPa. The T-c decreases with increasing pressure up to 13 GPa, which can be clearly correlated with the pressure dependence of c (or FeSe layer spacing). The T-c vs. c plot is compared with those of various (NH3)(y)MxFeSe (M: metal atoms) materials exhibiting different T-c and c, showing that the T-c is universally related to c. This behaviour means that a decrease in two-dimensionality lowers the T-c. No superconductivity was observed down to 4.3 K in (NH3)(y)Cs0.4FeSe at 11 and 13 GPa. Surprisingly, superconductivity re-appeared rapidly above 13 GPa, with the T-c reaching 49 K at 21 GPa. The appearance of a new superconducting phase is not accompanied by a structural transition, as evidenced by pressure-dependent XRD. Furthermore, T-c slowly decreased with increasing pressure above 21 GPa, and at 41 GPa superconductivity disappeared entirely at temperatures above 4.9 K. The observation of a double-dome superconducting phase may provide a hint for pursuing the superconducting coupling-mechanism of ammoniated/non-ammoniated metal-doped FeSe.

Web of Science ® 被引用回数 : 31

リンク情報
DOI
https://doi.org/10.1038/srep09477
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000352030700001&DestApp=WOS_CPL

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