Dresden 2003 – scientific programme
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TT: Tiefe Temperaturen
TT 14: Postersitzung III (Neue u. unkonventionelle Supraleiter, Anwendungen der Supraleitung, Dünne Schichten, JJs und SQUIDs, Schwere Fermionen, Kondo-Systeme)
TT 14.26: Poster
Wednesday, March 26, 2003, 14:30–19:00, P2c
High−Tc SQUID gradiometers with high field gradient resolution — •Katja Peiselt, Frank Schmidl, Arne-Stig Anton, Hagen Wald, Michael Mans, and Paul Seidel — Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, Helmholtzweg 5, 07743 Jena
We optimize the field gradient resolution of dc-SQUID gradiometers patterned out of thin films of the high−Tc superconductor YBa2Cu3O7−x. The sensors are prepared on SrTiO3 substrates, the Josephson junctions are realized by grain boundaries (bicrystal substrates).
Our efforts concern the enhancement of the responsitivity (Aeffd) of our sensors, where Aeff is the effective area and d the baselength of the gradiometer. We investigate a flip-chip gradiometer, where a superconducting antenna is inductively coupled to a read out gradiometer. The efficiency of the inductive coupling is optimized.
Furthermore we pattern gradiometers on 15mm x 15mm bicrystal substrates. Compared with sensor layouts realised on 10mm x 10mm bicrystal substrates the application of this substrate size enables a larger antenna area as well as a larger baselength of the sensors, which leads to a higher responsitivity.