Dresden 2011 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 50: SC: Tunneling, Josephson Junctions, SQUIDs 2
TT 50.2: Talk
Thursday, March 17, 2011, 14:15–14:30, HSZ 301
Magnetic field sensors based on growth modified bi-crystal grain boundaries — •Peter Michalowski, Christian Katzer, Daniel Kuhwald, Matthias Schmidt, Veit Grosse, Frank Schmidl, and Paul Seidel — Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, 07743 Jena, Germany
During the pulsed laser deposition of YBa2Cu3O7−δ (YBCO) gold nano clusters forming from an intermediate gold layer can modify the growth and crystalline structure of the YBCO film [1]. In a similar way also the properties of grain boundaries of films grown on bi-crystal substrates can be modified by gold nano clusters. As a result Josephson junctions fabricated from these films typically show changes in their superconducting properties, especially in the critical current IC, normal state resistance RN and the ICRN product.
Based on the experimental results of simple dc-Superconducting QUantum Interference Device (SQUID) structures with and without crystalline gold clusters we produced and analysed dc-SQUID gradiometers.
We present results of the temperature dependence of the critical current, the SQUID modulation (transfer function) depending on bias current and temperature as well as the London penetration depth as a function of temperature.
Grosse, V. et al. (2010), Formation of gold nano-particles during pulsed laser deposition of YBa2Cu3O7−δ thin films. Phys. Status solidi (RRL) - Rapid Research Letters, 4: 97-99.