ID | 55641 |
FullText URL | |
Author |
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
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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.
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Note | This is an article published by American Physical Society
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Published Date | 2016-11
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Publication Title |
Physical Review B
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Volume | volume94
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Issue | issue17
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Publisher | American Physical Society
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Start Page | 174505
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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.94.174505
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