Dresden 2006 – scientific programme

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TT: Tiefe Temperaturen

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

TT 7.13: Poster

Monday, March 27, 2006, 14:00–17:45, P1

Effect of H₂S treatment on the orientation and texture sharpness of MgO buffer layers on highly cube textured Ni-4at.%W tapes as a template for YBCO coated conductors — •Rainer Nast¹, Bernhard Obst¹, Oliver Stadel², and Wilfried Goldacker¹ — ¹Forschungszentrum Karlsruhe, Institut für Technische Physik, Postfach 3640, D-76021 Karlsruhe — ²TU Braunschweig, Institut für Oberflächentechnik (IOT), Bienroder Weg 53, D-38108 Braunschweig

To achieve high current carrying capabilities in YBCO coated conductors based on cube textured metal substrates, the texture and stability of the buffer/metal interface is a necessary requirement. In this work cube textured Ni-4at.%W substrate tapes were subjected to different H₂S treatments and the texture development of post-deposited MgO buffer layers was studied. The in-plane orientation and the texture sharpness of the MgO layers was found to depend strongly on the heat treatment time in Ar-10 ppm H₂S. Increasing the time from 5 to 60 min at 800^∘C changes the in-plane orientation from 45^∘ over 0^∘ to 45^∘ at 15 min and the texture sharpens continuously to an FWHM (220) of < 6^∘.