Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 8: Postersitzung I: Supraleitung
TT 8.12: Poster
Montag, 8. März 2004, 14:30–19:00, Poster A
Coated Conductors by Inclined Substrate Deposition — •A. Lümkemann1, J. Handke1, H. Kinder1, R. Nemetschek2, C. Hoffmann2, G. Sigl2, and W. Prusseit2 — 1TU München, Physik Department E10, 85748 Garching — 2THEVA Dünnschicht GmbH, Rote-Kreuz-Str. 8, 85727 Ismaning
Thermal evaporation is one of the most promising techniques for economic industrial scale production of second generation HTS wire. The in-plane alignment of the RBCO film necessary for high critical current densities can be achieved by depositing biaxially textured buffer layers by inclined substrate deposition (ISD).
The MgO buffer layer is grown at room temperature on electropolished Hastelloy tape by ISD using electron beam evaporation at roughly 3nm/s and inclination angle of 25∘ with respect to the substrate normal. This results in an in-plane alignment of 11∘ − 12∘ (FWHM). Meanwhile 33m long buffered Hastelloy tape has been fabricated using a 15 loop tape winder. HTS deposition is currently performed on 20m long and 1cm wide tape. Average critical current densities over several meters of tape are about 1.0MA/cm2 at 77K, i.e. 100A/cm of transport current in a 1µm DyBCO film.
We also present results on samples up to 20cm optained by HTS-deposition in static mode which can be summarized as follows: DyBCO on IBAD buffered tape exhibit critical current densities jc (77K) >2.0MA/cm2 whereas MgO-ISD-buffer sustain jc in the range of 1.6MA/cm2. Ni5%W-RABiTS tape can carry up to 0.8 - 1.2MA/cm2.