Direct study of structural phase transformation in single crystalline bulk and thin film BaFe2As2

A Pukenas; P Chekhonin; M Meißner; E Hieckmann; S Aswartham; J Freudenberger; J Engelmann; R Hühne; S Wurmehl; B Büchner; W Skrotzki

doi:10.1016/j.micron.2018.12.009

Direct study of structural phase transformation in single crystalline bulk and thin film BaFe₂As₂

Micron. 2019 Apr:119:1-7. doi: 10.1016/j.micron.2018.12.009. Epub 2018 Dec 27.

Authors

A Pukenas¹, P Chekhonin², M Meißner³, E Hieckmann³, S Aswartham⁴, J Freudenberger⁴, J Engelmann⁴, R Hühne⁴, S Wurmehl⁴, B Büchner⁴, W Skrotzki²

Affiliations

¹ Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062 Dresden, Germany. Electronic address: aurimas.pukenas@tu-dresden.de.
² Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062 Dresden, Germany.
³ Institut für Angewandte Physik, Technische Universität Dresden, 01062 Dresden, Germany.
⁴ IFW Dresden, 01069 Dresden, Germany.

PMID: 30639793
DOI: 10.1016/j.micron.2018.12.009

Abstract

The ternary iron arsenide compound BaFe₂As₂ exhibits a structural phase transition from tetragonal to orthorhombic at a temperature of about 140 K. The twin lamellae arising below this transition temperature were studied in undoped single crystalline bulk and epitaxial thin film samples using electron backscatter diffraction in a scanning electron microscope equipped with a helium cryostat. Applying this technique on bulk single crystals a characteristic twin lamella size in the range of 0.1 μm up to a few μm was observed. In contrast, in epitaxially strained thin films the phase transition is not observed at temperatures above 19 K.

Keywords: BaFe(2)As(2) low temperature; Cryogenic; EBSD; Phase; Superconductivity; Transformation.

Publication types

Research Support, Non-U.S. Gov't