Berlin 2008 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 10: Superconductivity: Fabrication and Characterization
TT 10.1: Talk
Monday, February 25, 2008, 14:00–14:15, H 3010
MOCVD and MOD process for Coated Conductors — •Oliver Stadel1, Ruslan Muydinov1, Jürgen Schmidt4, Hartmut Keune4, Georg Wahl1, Günter Kotzyba2, Anita Will2, Rainer Nast2, Alexandra Jung2, Wilfried Goldacker2, Sergej Samoilenkov3, Oleg Gorbenko3, and Andrej Kaul3 — 1TU Braunschweig, IOT, Bienroder Weg 53, 38108 Braunschweig — 2Forschungszentrum Karlsruhe, ITP, Hermann von Helmholtz Platz 1, 76344 Eggenstein Leopoldshafen — 3Mowcow State University V234, Department of Chemistry, Moscow 119 899 — 4PerCoTech AG, Bienroder Weg 53, 38176 Braunschweig
A MOCVD and a MOD process for contiuous deposition of oxide buffer layers and YBCO at once on long metal tapes was developed. Texured Ni(W) tapes were coated with oxide buffer layers at low oxygen partial pressure without oxidation of the metal tape. YBCO films of 350-1000 nm thick were obtained using tape velocity of 4 m/h. MOCVD and MOD buffer layers, which were delivered from partners of the Virtual Institute, were covered by YBCO. Entirely obtained by MOCVD superconductive samples revealed a critical current density of 1MA/cm2 at 77 K. The excellent in plane texture (FWHM = 5-6∘) and out of plane texture (FWHM = 1.4-3∘) of YBCO films may enable to increase the critical current density further. YBCO deposited on MOD obtained buffer layers reached the maximum critical current density 2MA/cm2.
Acknowledgement - The authors thank the partners of the Virtual Institute Chemically deposited YBCO Superconductors.