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Crystals 2016, 6(11), 142; doi:10.3390/cryst6110142

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

1
Division of Materials Sciences and Engineering, Ames Laboratory, U.S. Department of Energy, Ames, IA 50011, USA
2
Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA
3
Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Haidong Zhou
Received: 1 September 2016 / Revised: 25 October 2016 / Accepted: 4 November 2016 / Published: 9 November 2016
(This article belongs to the Special Issue Correlated Electron Crystals)
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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 TN ~ 80 K. The structural domains vanish below ~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 TN ~ 80 K, LTO1 to low temperature tetragonal (LTT) structure at Tc ~ 25 K, and LTT to low temperature orthorhombic (LTO2) structure at T ~ 15 K. View Full-Text
Keywords: reentrant phase transition; polarized optical images; structural domains reentrant phase transition; polarized optical images; structural domains
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Liu, Y.; Tanatar, M.A.; Timmons, E.; Lograsso, T.A. Polarized Light Microscopy Study on the Reentrant Phase Transition in a (Ba1 – xKx)Fe2As2 Single Crystal with x = 0.24. Crystals 2016, 6, 142.

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