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TT: Tiefe Temperaturen
TT 5: Supraleitung: Massivmaterialien, Bandleiter, Pinning, Vortexdynamik, Transporteigenschaften, Korngrenzen I
TT 5.13: Talk
Monday, March 24, 2003, 17:45–18:00, HSZ304
Improved Coated Conductors with Large Grain Boundary Areas — •G. Hammerl, A. Weber, A. Schmehl, C.W. Schneider, and J. Mannhart — Experimentalphysik VI, Bereich Elektronische Korrelationen und Magnetismus, Universität Augsburg, Universitätsstr. 1, 86159 Augsburg
Today’s coated conductors are still limited by the grain boundary problem, characterized by the strong dependence of the critical current density on the grain boundary angle. Therefore the coated conductors techniques are aimed to minimize the grain boundary problem of high-Tc superconductors by grain alignment.
Here we show that the critical current density of high-Tc wires can be greatly enhanced by using a threefold approach, which consists not only of grain alignment, but also of doping, and optimization of the grain architecture using grains with big aspect ratios.
According to model calculations, current densities of
4·106 A/cm2 can be achieved for an average grain
alignment of 10∘ at 77 K. Based on this approach, a road
to competitive high-Tc cables is proposed.
References
G. Hammerl et al., Eur. Phys. J. B
27, 299 (2002).
G. Hammerl et al., Appl. Phys. Lett. 81, 3209 (2002)