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TT: Tiefe Temperaturen

TT 10: Supraleitung: Massivmaterialien, Bandleiter, Pinning, Vortexdynamik, Transporteigenschaften, Korngrenzen II

TT 10.4: Vortrag

Dienstag, 25. März 2003, 15:30–15:45, HSZ304

Influence of the grain boundary network on the critical current of YBa₂Cu₃O₇ films grown on RABiTS substrates — •Laura Fernández G.R., Bernhard Holzapfel, Sarma Vadlamani, Jens Hänisch, and Ludwig Schultz — Helmholtzstr. 20, 01069 Dresden

YBa₂Cu₃O₇/YSZ/CeO₂ heterostructures have been grown epitaxially on biaxially textured Ni and Ni alloy substrates by pulsed laser deposition. The grain boundary network of these samples reduces the critical current density J_c when compared with the critical current density obtained for films grown on single crystalline substrates. It was found that the limitation of J_c can be reduced using RABiTS substrates with better texture. Transport measurements on coated conductor samples at different temperatures and magnetic fields have shown the presence of a crossover magnetic field between intergrain and intragrain critical current, which is shifted to lower values with improvement in the substrate texture quality.