ID | 51905 |
著者 |
Zheng, Lu
Okayama Univ, Res Lab Surface Sci
Izumi, Masanari
Okayama Univ, Res Lab Surface Sci
Sakai, Yusuke
Okayama Univ, Res Lab Surface Sci
Takabayashi, Yasuhiro
Okayama Univ, Res Lab Surface Sci
Onji, Taiki
Okayama Univ, Dept Phys
Araki, Shingo
Okayama Univ, Dept Phys
Kim, Jungeun
RIKEN, SPring Ctr 8, Japan Synchrotron Radiat Res Inst
Fujiwara, Akihiko
RIKEN, SPring Ctr 8, Japan Synchrotron Radiat Res Inst
|
抄録 | Alkali-metal-intercalated FeSe materials, (NH3)(y)M0.4FeSe (M: K, Rb, and Cs), have been synthesized using the liquid NH3 technique. (NH3)(y)Cs0.4FeSe shows a superconducting transition temperature (T-c) as high as 31.2 K, which is higher by 3.8 K than the T-c of nonammoniated Cs0.4FeSe. The T(c)s of (NH3)(y)K0.4FeSe and (NH3)(y)Rb0.4FeSe are almost the same as those of nonammoniated K0.4FeSe and Rb0.4FeSe. The T-c of (NH3)(y)Cs0.4FeSe shows a negative pressure dependence. A clear correlation between T-c and lattice constant c is found for ammoniated metal-intercalated FeSe materials, suggesting a correlation between Fermi-surface nesting and superconductivity.
|
発行日 | 2012-09-30
|
出版物タイトル |
Physical Review B
|
巻 | 88巻
|
号 | 9号
|
出版者 | The American Physical Society
|
ISSN | 1098-0121
|
資料タイプ |
学術雑誌論文
|
オフィシャル URL | http://link.aps.org/doi/10.1103/PhysRevB.88.094521
|
言語 |
英語
|
著作権者 | © 2013 The American Physical Society
|
論文のバージョン | publisher
|
査読 |
有り
|
DOI | |
Web of Science KeyUT |