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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 32.2: Poster

Mittwoch, 25. März 2009, 14:00–18:00, P1A

YBa₂Cu₃O₇ grain boundary junction dc SQUIDs for operation in high magnetic fields — •Konstantin Konovalenko, Joachim Nagel, Markus Turad, Matthias Bailer, Matthias Grünzweig, Reinhold Kleiner, and Dieter Koelle — Physikalisches Institut &Center for Collective Quantum Phenomena,Universität Tübingen,Germany

We investigate the suitability of dc SQUIDs for operation in high magnetic fields at 4.2 K. For this purpose, we fabricated small (micron-sized) YBa₂Cu₃O₇(YBCO) grain boundary junction dc SQUIDs on SrTiO₃ bicrystals with thin film Au shunt resistors. Fabrication was done by pulsed laser deposition of YBCO films, in-situ deposition of electron-beam evaporated Au films and Ar ion milling with photolithographically defined masks. For the fabricated SQUIDs we present results on electric transport properties, measured in a four-point arrangement, and on noise properties, measured with a Nb dc SQUID amplifier.