Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session
TT 33.43: Poster
Wednesday, March 28, 2012, 15:00–19:00, Poster B
Grain boundary high-Tc dc-SQUIDs with self-organized nanocrystals — •Stefanie Koch, Peter Michalowski, Christian Katzer, Markus Westerhausen, Frank Schmidl, and Paul Seidel — Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, 07743 Jena, Deutschland
We fabricated and investigated direct current superconducting quantum interference devices (dc-SQUIDs) based on YBa2Cu3O7−x (YBCO) grain boundary Josephson junctions. Directed embedding of gold nanoparticles different sizes can modify the crystalline structure and thus the superconducting properties of the YBCO thin films and grain boundaries. We investigated the growth conditions of these particles as well as their influence on the properties of the YBCO thin films. The variation of the size and distribution of the gold nanoparticles changes the electrical properties of the dc-SQUIDs. For this kind of device the normal resistance, critical current density, the resulting IcRN-product, the London penetration depth and transfer function are analyzed. Furthermore we will show noise properties for such modified dc-SQUIDs.