Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 5: Postersession Superconductivity: Materials - Fabrication and Properties

TT 5.19: Poster

Montag, 23. März 2009, 13:00–16:45, P1A

A new experimental setup for the preparation of oxide thin film - nanoparticle heterostructures — •Maria Sparing, Elke Backen, Ruben Hühne, Sebastian Fähler, Bernd Rellinghaus, Ludwig Schultz, and Bernhard Holzapfel — IFW Dresden, IMW, P.O. Box 270116, D-01171 Dresden, Germany

The application of superconducting YBa₂Cu₃O_7−x (YBCO) thin films in external magnetic fields is limited by their critical current density J_c. Since J_c strongly depends on the density and structure of pinning defects in the material, it can be improved by the introduction of artificial pinning centers, as e.g. created by nanoparticles. Although the influence of nanoparticles has been widely studied, a direct correlation between particle properties, defect structure and superconducting properties is still lacking, mainly because the control of the particle properties is not straight forward. Well controlled size distributions and areal densities of nanaoparticles with mean diameters between 3 nm and 20 nm can be obtained by DC magnetron sputtering in an inert gas atmosphere. We have already shown that, when implemented in YBCO thin film structures, such particles clearly influence J_c [1]. Here, we present a new experimental setup, which combines the inert gas condensation of nanoparticles with the preparation of oxide thin films by pulsed laser deposition in one chamber. This setup allows for the preparation of novel particle - thin film heterostructures, which yield the potential for a better understanding of the correlation between particle properties, defect structure and J_c.

[1] M. Sparing et al., Supercond. Sci. Technol. 20, 239 (2007)