Title
Fe-vacancy order and superconductivity in tetragonal <tex>$\beta-Fe_{1-x}Se$</tex> Fe-vacancy order and superconductivity in tetragonal <tex>$\beta-Fe_{1-x}Se$</tex>
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Washington, D.C. ,
Subject
Engineering sciences. Technology
Source (journal)
Proceedings of the National Academy of Sciences of the United States of America. - Washington, D.C.
Volume/pages
111(2014) :1 , p. 63-68
ISSN
0027-8424
1091-6490
ISI
000329350700039
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
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.
E-info
https://repository.uantwerpen.be/docman/iruaauth/76dd81/28a7054.pdf
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