このエントリーをはてなブックマークに追加
ID 55639
フルテキストURL
著者
Miao, Xiao Research Institute for Interdisciplinary Science, Okayama University
Terao, Takahiro Research Institute for Interdisciplinary Science, Okayama University
Yang, Xiaofan Research Institute for Interdisciplinary Science, Okayama University
Nishiyama, Saki Research Institute for Interdisciplinary Science, Okayama University
Miyazaki, Takafumi Research Laboratory for Surface Science, Okayama University
Goto, Hidenori Research Institute for Interdisciplinary Science, Okayama University
Iwasa, Yoshihiro Department of Applied Physics, The University of Tokyo
Kubozono, Yoshihiro Research Institute for Interdisciplinary Science, Okayama University
抄録
We have studied new superconductors prepared by metal doping of two-dimensional (2D) layered materials, FeSe and FeSe0.5Te0.5, using ethylenediamine (EDA). The superconducting transition temperatures (T(c)s) of metal-doped FeSe and metal-doped FeSe0.5Te0.5, i.e., (EDA)(y)MxFeSe and (EDA)(y)MxFeSe0.5Te0.5 (M: Li, Na, and K), were 31-45 K and 19-25 K, respectively. The stoichiometry of each sample was clarified by energy dispersive x-ray (EDX) spectroscopy, and the x-ray powder diffraction pattern indicated a large expansion of lattice constant c, indicating the cointercalation of metal atoms and EDA. The pressure dependence of superconductivity in (EDA)(y)NaxFeSe0.5Te0.5 has been investigated at a pressure of 0-0.8GPa, showing negative pressure dependence in the same manner as (NH3)(y)NaxFeSe0.5Te0.5. The T-c-c phase diagrams of MxFeSe and MxFeSe0.5Te0.5 were drawn afresh from the T-c and c of (EDA)(y)MxFeSe and (EDA)(y)MxFeSe0.5Te0.5, showing that the T-c increases with increasing c but that extreme expansion of c reverses the T-c trend.
備考
This is an article published by American Physical Society
発行日
2017-07
出版物タイトル
Physical Review B
96巻
1号
出版者
American Physical Society
開始ページ
014502
ISSN
2469-9950
NCID
AA11187113
資料タイプ
学術雑誌論文
言語
English
OAI-PMH Set
岡山大学
著作権者
American Physical Society
論文のバージョン
publisher
DOI
Web of Sience KeyUT
関連URL
isVersionOf https://doi.org/10.1103/PhysRevB.96.014502