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TT: Fachverband Tiefe Temperaturen

TT 10: Poster Session: Superconductivity

TT 10.2: Poster

Monday, March 14, 2011, 14:00–18:00, P4

Characterization of YBa₂Cu₃O_7−x -grain boundary contacts with Au-clusters — •Daniel Kuhwald, Christian Katzer, Ralf Erlebach, Matthias Schmidt, Veit Große, Frank Schmidl, and Paul Seidel — Friedrich-Schiller-University Jena, Institute of Solid State Physics, Helmholtzweg 5, 07743 Jena, Germany

In the course of the work YBa₂Cu₃O_7−x (YBCO) layers have been deposited epitaxially onto a bicrystalline strontium titanate substrate with an intermediate gold layer. During the deposition of YBCO the gold forms clusters, changing the crystallographic properties of the superconducting layer and especially the emerging grain boundary. In this way Josephson-junctions and simple DC-Superconducting Quantum Interference Devices (SQUIDs) have been produced both with and without gold nanoclusters and their electrical properties were investigated and compared among each other. We present the dependency of the critical current and the I_CR_N-product on the temperature. Furthermore the behaviour of the junctions in external magnetic fields and under microwave irradiation is shown. In all cases we discuss and compare the behaviour of junctions with and without gold nanoclusters.