Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 29: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs 1
TT 29.3: Talk
Wednesday, March 28, 2012, 15:30–15:45, H 2053
Further investigations on dc-SQUID gradiometers based on growth modified bi-crystal grain boundaries — •Peter Michalowski, Christian Katzer, Daniel Kuhwald, Stefanie Koch, Frank Schmidl, and Paul Seidel — Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, 07743 Jena, Germany
The properties of grain boundaries of YBa2Cu3O7−δ (YBCO) films grown on bi-crystal substrates can be modified by gold nano crystallites self-assembling from an intermediate gold layer during pulsed laser deposition [1]. These gold particles act as additional pinning centers in the YBCO layer [2].
Using a new layout, which enables us to restrict the gold nano crystallites only to the Superconducting QUantum Interference Device (SQUID) or the antenna structures, we fabricated dc-SQUID gradiometers.
We present results of the temperature dependence of the London penetration depth as well as of noise measurements carried out with ac- and dc-bias. In addition we investigated the dependence of the superconducting properties on the thickness of the initial gold layer.
P. Michalowski et al., Physica Status Solidi - Rapid Research Letters 5 (2011) 268-270.
Katzer et al., EPL 95 (2011) 68005.