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TT: Fachverband Tiefe Temperaturen

TT 9: SC: Poster Session

TT 9.19: Poster

Monday, March 22, 2010, 14:00–18:00, Poster A

Preparation and investigation of tunnel junctions based on ironpnictide superconductors — •Stefan Schmidt¹, Sebastian Döring¹, 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

Examination of superconductor tunnel structures allows experimental proof of theoretical predictions about their superconducting properties. Especially for the new iron arsenide based superconductors those examinations are of great importance, because they lead to basic understanding of physical processes in those materials, such as determination of the energy gap and its temperature dependence.

Based on LaO_1−xF_xFeAs thin films grown via pulsed laser deposition (PLD) on LaAlO₃ substrates, we prepared superconductor - normal conductor - superconductor (S-N-S) tunnel structures by using photolithography, ion beam etching as well as insulating SiO₂ layers. We present first measuring of a LaO_1−xF_xFeAs / Au / PbIn system and discuss possibilities for further examinations, including variation of the barrier respectively covering electrode materials on this basis.