Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 7: Analytical Electron Microscopy: SEM and TEM-based Material Analysis

MA 7.4: Vortrag

Montag, 20. März 2017, 11:00–11:15, MER 02

Cryo-EBSD on BaFe₂As₂ single crystals — •Aurimas Pukenas¹, Paul Chekhonin¹, Ellen Hieckmann², Martin Meißner², Saicharan Aswartham³, Jan Engelmann³, Bernhard Holzapfel⁴, Sabine Wurmehl³, Bernd Büchner³, and Werner Skrotzki¹ — ¹Institut für Strukturphysik, Technische Universität Dresden, 01069 Dresden, Germany — ²Institut für Angewandte Physik, Technische Universität Dresden, 01069 Dresden, Germany — ³Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, 01069 Dresden, Germany — ⁴Institut für Technische Physik, Karlsruher Institut für Technologie, 76344 Eggenstein-Leopoldshafen, Germany

BaFe₂As₂ belongs to the family of iron-based high temperature superconductors. In previous publications it was reported that superconductivity occurs under certain conditions, e.g. by chemical doping, pressure or epitaxial strain. Undoped BaFe₂As₂ orders antiferromagnetically at T_C ≈ 140 K and simultaneously undergoes a tetragonal I4/mmm to orthorhombic Fmmm structural phase transition. The orthorhombic structure leads to the formation of twin lamellae. Investigations reported so far using transmission electron microscopy and polarized light microscopy show inconclusive results with respect to the domain size. To achieve high spatial resolution (≤ 100 nm) an experimental setup was used consisting of a scanning electron microscope with sample holder on a helium cryostat and electron backscatter diffraction (EBSD) technique. EBSD mappings of domains below T_C and after a cooling-warming cycle will be presented and discussed.