Berlin 2005 – scientific programme
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TT: Tiefe Temperaturen
TT 23: Posters Superconductivity, Solids at Low Temperature
TT 23.10: Poster
Monday, March 7, 2005, 14:00–18:00, Poster TU D
Preparation of buffer layer architectures based on surface oxidized Ni tapes for coated conductor applications — •R. Hühne, D. Selbmann, J. Eickemeyer, L. Schultz, and B. Holzapfel — IFW Dresden, Germany
The preparation of cube textured NiO buffer layers on biaxially textured Ni tapes (RABiTS) using surface oxidation epitaxy (SOE) offers a cheap and scalable route for the production of long-length YBCO coated conductors. Therefore, thin highly textured NiO layers have been grown on different microalloyed Ni-tapes. A second buffer layer is necessary to ensure epitaxial growth of the YBCO as well as to prevent Ni contamination of the superconducting layer. Different perovskite buffer were successfully grown on SOE-NiO using pulsed laser deposition (PLD). Among them, BaZrO3 and SrZrO3 buffers show a high quality epitaxial growth on NiO with an in-plane orientation similar to the underlying NiO. The subsequent deposition of YBCO on top of these buffers requires a thin intermediate SrTiO3 layer resulted in epitaxial layers with a Tc above 87 K and Jc up to 1.6 MA/cm−2. Microstructural investigations showed that the surface topography of the buffer layers and the YBCO is mainly determined by the quality of the NiO layer.