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TT: Tiefe Temperaturen
TT 5: Supraleitung: Massivmaterialien, Bandleiter, Pinning, Vortexdynamik, Transporteigenschaften, Korngrenzen I
TT 5.10: Talk
Monday, March 24, 2003, 17:00–17:15, HSZ304
Ca-doping Induced Enhancement of the Critical Currents of Coated Conductors Grown by Ion Beam Assisted Deposition — •A. Weber1, G. Hammerl1, B. Schey2, M. Kuhn2, A. Schmehl1, C.W. Schneider1, and J. Mannhart1 — 1Experimentalphysik VI, Bereich Elektronische Korrelationen und Magnetismus, Universitätsstrasse 1, 86135 Augsburg — 2AxynTeC Dünnschichttechnik, Am Mittleren Moos 48, 86167 Augsburg
The most promising approaches to the fabrication of competitive cables from high-Tc superconductors are the coated conductor technologies. Among these methods the ion beam assisted deposition (IBAD) technique is one of the most developed. The performance of the superconductors fabricated by IBAD, and the fabrication costs, are to a great extent determined by the critical current densities of the superconductors’ grain boundaries. It has been found in bicrystalline samples, however, that the critical current density of grain boundaries can be improved by appropriate doping. On this account we have explored whether overdoping also enhances the critical currents of standard IBAD samples. The measurements show that, depending on the critical current density of the superconducting film, Jc is enhanced by factors as large as 2.2, at all temperatures up to Tc. At 77 K the Jc enhancement persists in magnetic fields of at least 8 T.