Title
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Fe-vacancy order and superconductivity in tetragonal
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Author
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Abstract
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Several superconducting transition temperatures in the range of 30-46 K were reported in the recently discovered intercalated FeSe system (A(1-x)Fe(2-y)Se(2), A = K, Rb, Cs, Tl). Although the superconducting phases were not yet conclusively decided, more than one magnetic phase with particular orders of iron vacancy and/or potassium vacancy were identified, and some were argued to be the parent phase. Here we show the discovery of the presence and ordering of iron vacancy in nonintercalated FeSe (PbO-type tetragonal beta-Fe1-xSe). Three types of iron-vacancy order were found through analytical electron microscopy, and one was identified to be non-superconducting and magnetic at low temperature. This discovery suggests that the rich-phases found in A(1-x)Fe(2-y)Se(2) are not exclusive in Fe-Se and related superconductors. In addition, the magnetic beta-Fe1-xSe phases with particular iron-vacancy orders are more likely to be the parent phase of the FeSe superconducting system instead of the previously assigned beta-Fe1+delta Te. |
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Language
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English
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Source (journal)
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Proceedings of the National Academy of Sciences of the United States of America. - Washington, D.C.
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Publication
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Washington, D.C.
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2014
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ISSN
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0027-8424
[Print]
1091-6490
[Online]
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DOI
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10.1073/PNAS.1321160111
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Volume/pages
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111
:1
(2014)
, p. 63-68
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ISI
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000329350700039
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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