| Re-emerging superconductivity at 48 kelvin in iron chalcogenides. | |
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MedLine Citation:
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PMID: 22367543 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Pressure has an essential role in the production and control of superconductivity in iron-based superconductors. Substitution of a large cation by a smaller rare-earth ion to simulate the pressure effect has raised the superconducting transition temperature T(c) to a record high of 55 K in these materials. In the same way as T(c) exhibits a bell-shaped curve of dependence on chemical doping, pressure-tuned T(c) typically drops monotonically after passing the optimal pressure. Here we report that in the superconducting iron chalcogenides, a second superconducting phase suddenly re-emerges above 11.5 GPa, after the T(c) drops from the first maximum of 32 K at 1 GPa. The T(c) of the re-emerging superconducting phase is considerably higher than the first maximum, reaching 48.0-48.7 K for Tl(0.6)Rb(0.4)Fe(1.67)Se(2), K(0.8)Fe(1.7)Se(2) and K(0.8)Fe(1.78)Se(2). |
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Authors:
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Liling Sun; Xiao-Jia Chen; Jing Guo; Peiwen Gao; Qing-Zhen Huang; Hangdong Wang; Minghu Fang; Xiaolong Chen; Genfu Chen; Qi Wu; Chao Zhang; Dachun Gu; Xiaoli Dong; Lin Wang; Ke Yang; Aiguo Li; Xi Dai; Ho-Kwang Mao; Zhongxian Zhao |
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Publication Detail:
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Type: Journal Article Date: 2012-02-22 |
Journal Detail:
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Title: Nature Volume: 483 ISSN: 1476-4687 ISO Abbreviation: Nature Publication Date: 2012 Mar |
Date Detail:
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Created Date: 2012-03-02 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0410462 Medline TA: Nature Country: England |
Other Details:
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Languages: eng Pagination: 67-9 Citation Subset: IM |
Affiliation:
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1] Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China [2]. |
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