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TT: Fachverband Tiefe Temperaturen

TT 12: Poster Session Superconductivity

TT 12.41: Poster

Monday, March 11, 2013, 15:00–19:00, Poster D

Studies on the processing of Ba-122 single crystals for the development of tunnel junctions — •David Reifert¹, Stefan Schmidt¹, Sebastian Döring¹, Martin Feltz¹, Sandra Gottwals¹, Noor Ali Hasan¹, Manuel Monecke¹, Thomas Wolf², Frank Schmidl¹, and Paul Seidel¹ — ¹Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, 07743 Jena, Germany — ²Karlsruhe Institute of Technology, Institut für Festkörperphysik, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany

The investigation of the superconducting properties of iron-based single crystals is important for the understanding of transport mechanisms responsible for superconductivity in those materials. Tunnel junctions are necessary in order to realize phase-sensitive measurement geometries for the investigation of the order parameter symmetry. To fabricate such tunnel junctions on Co-doped BaFe₂As₂(Ba-122) single crystals, which were produced with a self-flux method, we had to solve several issues. Using thin film technology requires high quality surfaces, so we show the results of several planarization techniques e.g. chemical mechanical polishing, ion beam smoothing, and crystal cleaving. Finally, we present first electrical measurements on photolithographically patterned Ba-122 single crystals.

This work was partially supported by DFG within SPP 1458 under project no. (SE 664/15-1), the German Academic Exchange Service (DAAD), and the Landesgraduiertenförderung Thüringen.