Volume 95, Number 6, September 2011
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||08 September 2011|
Increased flux pinning in YBa2Cu3O7−δ thin-film devices through embedding of Au nano crystals
Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena - Helmholtzweg 5, D-07743 Jena, Germany, EU
2 Max-Planck-Institut für Intelligente Systeme - Heisenbergstrasse 3, D-70569 Stuttgart, Germany, EU
3 Hochschule Aalen - Beethovenstrasse 1, D-73430 Aalen, Germany, EU
4 Institute of Photonic Technology - Albert-Einstein-Strasse 9, D-07745 Jena, Germany, EU
5 Institut für Materialwissenschaft und Werkstofftechnologie, Friedrich-Schiller-Universität Jena Löbdergraben 32, D-07743 Jena, Germany, EU
Accepted: 5 August 2011
We prepared direct-current superconducting quantum interference device (dc-SQUID) gradiometers consisting of a single YBa2Cu3O7- δ (YBCO) layer on SrTiO3 (STO) bicrystal substrates. The superconducting thin film was modified by embedding crystalline gold nanoparticles. We investigated the growth conditions of these particles as well as their influence on the properties of the YBCO thin film. In our magneto-optical measurements we found that the presence of embedded nano crystals results in a distinct enhancement of jc over the whole investigated temperature range. We attribute the higher critical current density to an increased pinning, which also results in a reduction of the flux noise of our investigated gradiometers.
PACS: 85.25.Dq – Superconducting quantum interference devices (SQUIDs) / 74.25.Sv – Critical currents / 74.25.Wx – Vortex pinning (includes mechanisms and flux creep)
© EPLA, 2011
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