Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 15: Superconductivity: Poster Session
TT 15.4: Poster
Dienstag, 26. Februar 2008, 14:00–18:00, Poster B
Electrical properties of thin YBa2Cu3O7−x films with embedded gold nano clusters — •Sebastian Engmann, Uwe Schinkel, Veit Grosse, Christoph Becker, Alexander Steppke, Frank Schmidl, and Paul Seidel — Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, Helmholtzweg 5, D-07743 Jena
High temperature superconducting devices such as magnetometers or gradiometers are usually made from a single thin film, although each part of the device needs to fulfill special requirements. These are for example a low flux noise in antenna structures and a low contact resistance to the bonding pads. These requirements can be achieved by embedding gold nano clusters in thin films of YBa2Cu3O7−x (YBCO), since they can act as flux pinning centers and they increase contact area to the film.
We present studies on the formation of gold nano clusters during the pulsed laser deposition of thin YBCO films in dependence on the gold film thickness. We verified the high crystalline quality of the films by measuring Rocking curve widths. Size and distribution of the gold clusters were determined from AFM measurements. We compare the superconducting and noise properties of bridge structures and gradiometers with devices made of conventional YBCO films.