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ID 55639
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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
Abstract
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.
Note
This is an article published by American Physical Society
Published Date
2017-07
Publication Title
Physical Review B
Volume
volume96
Issue
issue1
Publisher
American Physical Society
Start Page
014502
ISSN
2469-9950
NCID
AA11187113
Content Type
Journal Article
language
英語
OAI-PMH Set
岡山大学
Copyright Holders
American Physical Society
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DOI
Web of Sience KeyUT
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isVersionOf https://doi.org/10.1103/PhysRevB.96.014502