Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 7: Superconductivity & Solids At Low Temperature - Poster Session

TT 7.11: Poster

Montag, 27. März 2006, 14:00–17:45, P1

Optimisation of La₂Zr₂O₇ buffer layers and CeO₂ cap layers on Ni RABiTS for YBCO coated conductors using chemical solution deposition — •Sebastian Engel, Kerstin Knoth, Thomas Thersleff, Heike Schlörb, Ruben Hühne, Ludwig Schultz, and Bernahrd Holzapfel — IFW Dresden, Helmholtzstr. 20, D-01069 Dresden, Germany

Chemical Solution Deposition (CSD) has been used to prepare biaxially textured cerium oxide cap layers and La₂Zr₂O₇ (LZO) buffer layers on Ni RABiTS. For the cerium oxide cap layer, a precursor solution consisting of dissolved Ce(III)-acetate in propionic acid, 2,5-pentandion, and 2-propanol was used. The LZO precursor solution was prepared by dissolving La-, and Zr-2,4-pentanedionates in propionic acid. Both, prepared buffer and cap layers were dip-coated and subsequently heat-treated at various temperatures between T = 900^∘C and 1100^∘C under different gas flow conditions. The surface texture quality was analysed with Reflection High Energy Electron Diffraction (RHEED) and Electron Back Scattering Diffraction (EBSD). EBSD maps show nearly 100 % biaxially textured surfaces for the optimised LZO buffer layers and cerium oxide cap layer. Further surface properties were investigated by atomic force microscopy and secondary electron microscopy. 300nm thick YBa₂ Cu₃ O_7−δ test structures were prepared on this buffer layer system CeO₂ (CSD)/LZO (CSD)/ Ni-5 % W tape by pulsed laser deposition and characterised by resistivity measurements at 77 K in magnetic fields up to 9 T.