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