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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 YBa₂Cu₃O_7−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.