Regensburg 2007 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 12: Symposium “Coated HTS Conductors”

TT 12.2: Talk

Tuesday, March 27, 2007, 10:00–10:15, H20

A Reel to Reel MOCVD process for Coated Conductors — •Oliver Stadel¹, Ruslan Muydinov¹, Jürgen Schmidt¹, Hartmut Keune¹, Georg Wahl¹, Sergej Samoilenkov², Andrej Blednov², Georgy Dosovitskiy², Oleg Gorbenko², and Andrey Kaul² — ¹Institut für Oberflächentechnik, TU Braunschweig, Bienroder Weg 53, 38108 Braunschweig — ²Moscow Department of Chemistry, State University V 234, Moscow,119 899, Russia

A MOCVD process for contiuous deposition of YBCO and oxide buffer layers on long metal tapes was developed. Texured Ni alloyed tapes were coated with oxide buffer layers at low oxygen partial pressure without oxidation of the metal tape. 350-1000 nm thick YBCO films were deposited at a tape velocity of 4 m/h. MOCVD buffer layers and additional samples, which were delivered from partners of the Virtual Institute, were used. The YBCO films on chemically coated buffer layers exhibit 0.3-7 MA/cm2 at 77 K. On PVD coated buffer layers the critical current density was 1-2 MA/cm2. The excellent in plane texture (FWHM = 5-6°) and out of plane texture (FWHM = 1.4-3°) of the YBCO films on chemically coated buffer layers may enable to increase further the critical current density.

Acknowledgement: The authors thank the partners of the Virtual Institute Chemically deposited YBCO Superconductors. We acknowledge the financial support by Ministry of Science and Culture of Lower Saxony and the European Community in frame of the ESF/EFRE project SuperConTech and the Helmholtz Gemeinschaft e.V. for financial support.