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Formation mechanism of superconducting phase and its three-dimensional architecture in pseudo-single-crystal KxFe2-ySe2

TitleFormation mechanism of superconducting phase and its three-dimensional architecture in pseudo-single-crystal KxFe2-ySe2
Publication TypeJournal Article
Year of Publication2016
AuthorsLiu, Y, Xing, QF, Straszheim, WE, Marshman, J, Pedersen, P, McLaughlin, R, Lograsso, TA
JournalPhysical Review B
Volume93
Pagination064509
Date Published02
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000370021300002
Keywordsorder, separation
Abstract

order-disorder transition. It should be emphasized that the phase separation in pseudo-single-crystal KxFe2-ySe2 is caused by the iron-vacancy order-disorder transition. The shrinkage of the high-temperature phase and the expansion of the newly created iron-vacancy-ordered phase during the phase separation rule out the mechanism of spinodal decomposition proposed in an early report [Z. Wang et al., Phys. Rev. B 91, 064513 (2015)]. Since the formation of the superconducting phase relies on the occurrence of the iron-vacancy order-disorder transition, it is impossible to synthesize a pure superconducting phase by a conventional solid state reaction ormelt growth. By focused ion beam scanning electronmicroscopy, we further demonstrate that the superconducting phase forms a contiguous three-dimensional architecture composed of parallelepipeds that have a coherent orientation relationship with the iron-vacancy-ordered phase.

DOI10.1103/PhysRevB.93.064509
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