Dresden 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 32: Postersession Superconductivity: Josephson Junctions, SQUIDs, Heterostructures, Andreev Scattering, Vortex Physics, Cryodetectors, Measuring Devices, Cryotechnique
TT 32.7: Poster
Mittwoch, 25. März 2009, 14:00–18:00, P1A
Two dimensional planar SQUID-Gradiometer on a SrTiO3-bicrystal — •Uwe Schinkel1, Christoph Becker1, Alexander Steppke2, Katharina Hoefer1, Martin Pollithy1, Veit Grosse1, Sebastian Engmann1, Frank Schmidl1, and Paul Seidel1 — 1Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, D-07743 Jena, Germany — 2Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, D-01187 Dresden, Germany
We designed a dc-SQUID-Gradiometer layout based on YBa2Cu3O7−x thin films on SrTiO3 bicrystals and crossed bicrystals to detect the first order field gradient. In a planar configuration four galvanically coupled antenna structures can be read out by four dc-SQUIDs. Measuring the voltage modulation in an excitation coil changed magnetic field abnormal behaviour occurs. A redistribution of the screening current in the antennas can produce this disturbance. We present the layout, the preparation and the characteristics of each dc-SQUID. Especially the abnormal behaviours of the voltage modulation are analyzed. Therefore the influences of a homogenous magnetic field perpendicular to the gradiometer are studied.