Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Poster Session

TT 15.39: Poster

Tuesday, February 26, 2008, 14:00–18:00, Poster B

Two dimensional planar superconducting quantum interference device gradiometer on a SrTiO₃ bicrystal — •Uwe Schinkel, Christoph Becker, Veit Grosse, Alexander Steppke, Frank Schmidl, and Paul Seidel — Institut für Festkörperphysik, Friedrich Schiller Universität Jena, Germany

Superconducting sensors are state of the art for the measurement of small magnetic signals. Gradiometers with DC SQUID sensors can be used in magnetically unshielded areas, due to the high surpression of homogeneous magnetic fields. 2nd order gradiometers achieve an even higher reduction of external noise.

We show a new gradiometer layout based on YBCO thin films to detect the second order field gradient. In a planar configuration four galvanically coupled antenna structures are read out by a symmetric DC SQUID with four Josephson junctions on SrTiO₃ bicrystals. Simulations, the preparation process and first electric measurements are presented.