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ID 55641
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Zheng, Lu Research Institute for Interdisciplinary Science, Okayama University
Sakai, Yusuke Research Institute for Interdisciplinary Science, Okayama University
Miao, Xiao Research Institute for Interdisciplinary Science, Okayama University
Nishiyama, Saki Research Institute for Interdisciplinary Science, Okayama University
Terao, Takahiro Research Institute for Interdisciplinary Science, Okayama University
Eguchi,, Ritsuko Research Institute for Interdisciplinary Science, Okayama University
Goto, Hidenori Research Institute for Interdisciplinary Science, Okayama University
Kubozono, Yoshihiro Research Institute for Interdisciplinary Science, Okayama University
Abstract
Na-intercalated FeSe0.5Te0.5 was prepared using the liquid NH3 technique, and a superconducting phase exhibiting a superconducting transition temperature (T-c) as high as 27 K was discovered. This can be called the high-T-c phase since a 21 K superconducting phase was previously obtained in (NH3)(y)NaxFeSe0.5Te0.5. The chemical composition of the high-T-c phase was determined to be (NH3)(0.61(4))Na-0.63(5) Fe0.85Se0.55(3) Te-0.44(2). The x-ray diffraction patterns of both phases show that a larger lattice constant c (i.e., FeSe0.5Te0.5 plane spacing) produces a higher T-c. This behavior is the same as that of metal-doped FeSe, suggesting that improved Fermi-surface nesting produces the higher T-c. The high-T-c phase converted to the low-T-c phase within several days, indicating that it is a metastable phase. The temperature dependence of resistance for both phases was recorded at different magnetic fields, and the critical fields were determined for both phases. Finally, the T-c versus c phase diagram was prepared for the metal-doped FeSe0.5Te0.5, which is similar to that of metal-doped FeSe, although the T-c is lower.
Note
This is an article published by American Physical Society
Published Date
2016-11
Publication Title
Physical Review B
Volume
volume94
Issue
issue17
Publisher
American Physical Society
Start Page
174505
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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publisher
DOI
Web of Science KeyUT
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isVersionOf https://doi.org/10.1103/PhysRevB.94.174505