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TT: Fachverband Tiefe Temperaturen
TT 10: Poster Session: Superconductivity
TT 10.3: Poster
Montag, 14. März 2011, 14:00–18:00, P4
Integration of predefined gas-phase condensed nanoparticles into YBa2Cu3O7−δ thin film multilayers — •Maria Sparing, Tom Thersleff, Jens Hänisch, Ingolf Mönch, Ruben Hühne, Sebastian Fähler, Bernd Rellinghaus, Ludwig Schultz, and Bernhard Holzapfel — IFW Dresden, P.O. Box: 270116, 01171 Dresden, Germany
The critical current density Jc in YBa2Cu3O7−δ (YBCO) thin films, which limits their application in external magnetic fields, can be enhanced by the introduction of artificial pinning centers e.g. created by non-superconducting nanoparticles and surrounding defects and strain states. A controlled preparation of nanoparticles with adjustable properties is required in order to understand the correlation between the superconducting characteristics, the particles and the defect structure. Isolated particles with a predefined diameter in the range of 10 nm and an independently chosen areal density can be prepared via dc-magnetron sputtering in an inert gas flow. Here we present the integration of such gas phase condensed Hafnium nanoparticles into PLD-grown YBCO thin film multilayers in a combined PLD-Sputtering system. These heterostructures were investigated by TEM on cross sectional FIB lamellae. The influence of the areal density and the particle volume content on the structural and superconducting properties of YBCO thin films is discussed. Furthermore, advantages and consequences of this new technique for the preparation of nanoparticle thin film heterostructures are evaluated.