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Polarized Light Microscopy Study on the Reentrant Phase Transition in a (Ba1-xKx) Fe2As2 Single Crystal with x=0.24

TitlePolarized Light Microscopy Study on the Reentrant Phase Transition in a (Ba1-xKx) Fe2As2 Single Crystal with x=0.24
Publication TypeJournal Article
Year of Publication2016
AuthorsLiu, Y, Tanatar, MA, Timmons, E, Lograsso, TA
JournalCrystals
Volume6
Pagination142
Date Published11
Type of ArticleArticle
ISBN Number2073-4352
Accession NumberWOS:000390105400006
KeywordsCrystallography, iron pnictides, Materials Science, polarized optical images, reentrant phase transition, structural domains, superconductivity
Abstract

A sequence of structural/magnetic transitions on cooling is reported in the literature for hole-doped iron-based superconductor (Ba1-xKx) Fe2As2 with x = 0.24. By using polarized light microscopy, we directly observe the formation of orthorhombic domains in (Ba1-xKx) Fe2As2 (x = 0.24) single crystal below a temperature of simultaneous structural/magnetic transition T-N similar to 80 K. The structural domains vanish below similar to 30 K, but reappear below T = 15 K. Our results are consistent with reentrance transformation sequence from high-temperature tetragonal (HTT) to low temperature orthorhombic (LTO1) structure at T-N similar to 80 K, LTO1 to low temperature tetragonal (LTT) structure at T-c similar to 25 K, and LTT to low temperature orthorhombic (LTO2) structure at T similar to 15 K.

DOI10.3390/cryst6110142
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Short TitleCrystals
Alternate JournalCrystals