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TT: Fachverband Tiefe Temperaturen

TT 81: Superconductivity: Properties and Electronic Structure

TT 81.7: Vortrag

Donnerstag, 3. April 2014, 11:00–11:15, HSZ 201

Tuning the performance of YBa₂Cu₃O_7−δ thin films by a local incorporation of gold nanoparticles — •Christian Katzer¹, Markus Westerhausen¹, Claudia Stahl², Joachim Albrecht³, Evelyn Stilp⁴, Andreas Suter⁴, and Frank Schmidl¹ — ¹Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, 07743 Jena — ²Max-Planck-Institut für Intelligente Systeme, Heisenbergstraße 3, 70569 Stuttgart — ³Hochschule Aalen, Beethovenstraße 1, 73430 Aalen — ⁴Laboratory for Muonspin Spectroscopy, PSI, CH-5232 Villigen PSI, Switzerland

Many superconducting thin film applications require a spatially resolved current carrying capability due to different boundary conditions. On the one hand, the critical current density should be increased for high-current applications or in the antenna structures of sensor devices like gradiometers; on the other hand, the critical current of Josephson Junctions must not be too high to ensure a proper functionality. We report that a local incorporation of crystalline gold nanoparticles in YBa₂Cu₃O_7−δ thin films allows engineering the critical current landscape on the sub-micrometre scale. Meanwhile, as we will show the growth conditions of the YBCO are modified, resulting in less a-axis growth and an improved oxygen stoichiometry. Furthermore, we will present Muon Spin Spectroscopy measurements of the London-penetration depth which indicate a reduced defect density in YBCO thin films modified by Au particles.
C. Katzer, et al., Supercond. Sci. Techn. 26, 125008 (2013)
C. Katzer et al., New J. Phys. 15, 113029 (2013)