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TT: Fachverband Tiefe Temperaturen

TT 9: SC: Poster Session

TT 9.20: Poster

Montag, 22. März 2010, 14:00–18:00, Poster A

Investigation on ironarsenide superconductors for their application in Josephson junctions — •Sebastian Döring¹, Stefan Schmidt¹, Veit Große¹, Frank Schmidl¹, Paul Seidel¹, Martin Kidszun², Silvia Haindl², Bernhard Holzapfel², and Ingolf Mönch² — ¹Friedrich-Schiller-University Jena, Institute of Solid State Physics, Helmholtzweg 5, 07743 Jena, Germany — ²IFW Dresden, Institute for Metallic Materials, Helmholtzstrasse 20, 01069 Dresden. Germany

We investigate the possibility to produce and characterize Josephson junctions, based on new ironarsenide superconductors. Starting with LaO_1−xF_xFeAs thin films, which were produced by pulsed laser deposition (PLD), we present structures, in which Josephson effects can be studied. Because of the technological requirements, tunnel-like structures with natural or artificial barriers seems to be best suited for such investigations. Therefore the ironarsenide base electrode and subsequently the tunnel area were structured by ion beam etching. Sputtered SiO₂ thin films were used as insulating materials. For the counter electrode, conventional superconductors (e.g. Pb, Nb) can be used. We present the first measurement on such systems.