Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 62: Superconductivity: Properties, Electronic Structure, Order Parameter

TT 62.10: Talk

Thursday, March 14, 2013, 17:45–18:00, H19

Gold nanocrystals in high-temperature superconducting films: Creation of pinning patterns of choice — •Christian Katzer¹, Claudia Stahl², Peter Michalowski¹, Sebastian Treiber², Georg Christiani³, Frank Schmidl¹, Paul Seidel¹, Gisela Schütz², and Joachim Albrecht⁴ — ¹Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, 07743 Jena — ²Max-Planck-Institut für Intelligente Systeme, Heisenbergstraße 3, 70569 Stuttgart — ³Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart — ⁴Hochschule Aalen, Beethovenstraße 1, 73430 Aalen

Many superconducting thin film devices require a spatially resolved current carrying capability due to different boundary conditions. On the one hand, the critical current density and the pinning of flux lines respectively should be high to reduce flux noise in the antenna regions of gradiometers; on the other hand, the critical current density of the Josephson junctions itself must not be too high to ensure a proper functionality. We report that adding gold nanoparticles during the preparation process of epitaxial YBa₂Cu₃O_7−δ thin films offers the possibility of creating spatially varying flux pinning properties, thus allowing to locally enhance the critical current density up to a factor of two. Magneto-optical investigations as well as transport measurements will be presented, indicating that an Au particle induced modification of the YBCO pinning properties allows the engineering of the critical current landscape on the sub-micrometre scale.