Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 12: Poster Session Superconductivity

TT 12.39: Poster

Montag, 11. März 2013, 15:00–19:00, Poster D

Processing of insulation barriers for the development of tunneling junctions based on pnictide superconductors — •Manuel Monecke, Stefan Schmidt, Sebastian Döring, Martin Feltz, Noor Ali Hasan, David Reifert, Frank Schmidl, and Paul Seidel — Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, 07743 Jena, Germany

Josephson junctions are an excellent tool for the investigation on pnictide superconductors, especially for the understanding of the transport mechanisms in such materials. For the preparation of those Josephson junctions it is important to have high resistance insulating tunneling barriers because the measurements are more purposeful than measurements with low resistance conductive barriers. Metal (e.g. gold) as barrier material has a very low resistance even at the maximum layer thickness. Therefore, disturbing effects like Andreev reflection become significant. Because of these issues it is highly important to study these tunnel barrier materials, their electrical properties and deposition processes. We present initial investigations on the deposition of sputtered oxide tunnel barriers and their properties. Furthermore, we discuss interface effects between base electrode, barrier, and cover electrode.

This work was partially supported by DFG under project no. SE 664/15-1, the DAAD, EU project IRON-SEA no. FP7-283141 and the Landesgraduiertenförderung Thüringen.