Regensburg 2007 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 12: Symposium “Coated HTS Conductors”
TT 12.11: Talk
Tuesday, March 27, 2007, 12:45–13:00, H20
Improved pinning in YBa2Cu3O7−x based quasi-multilayers prepared by off-axis pulsed laser deposition — •Elke Backen, Karolin Tscharntke, Sebastian Engel, Ruben Hühne, Ludwig Schultz, and Bernhard Holzapfel — IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany
Higher in-field Jc values of thin YBa2Cu3O7−x (YBCO) films due to pinning at artificial pinning centers are of great interest for the development and improvement of coated conductors. It is possible to enhance the pinning forces in YBCO by introducing nanosized particles into the films using quasi-multilayers of YBCO and a transistion metal (Hf, Zr, Ir) by on-axis pulsed laser deposition [1,2]. In order to improve reproducibility, off-axis PLD was used to prepare YBCO/Hf multilayers. Due to the oxidizing deposition atmosphere and solid state reaction with the YBCO phase, nanometre sized perovskite precipitates, that are biaxially textured with a well-defined relationship towards the YBCO lattice were formed. Pinning properties and the Jc anisotropy were characterized using magneto-transport measurements at various fields and temperatures. A significant improvement of Jc as well as irreversibility field Birr could be observed in the off-axis deposited quasi-multilayers.
[1] Hänisch et al. Appl. Phys. Lett. 86 (2005) 122508.
[2] Hänisch et al. Supercond. Sci. Technol. 19 (2006) 534-540.