Preparation of coated conductor architectures on Ni composite tapes

Abstract

An epitaxial Y2O3/YSZ/CeO2 buffer architecture has been prepared using pulsed laser deposition on cube textureNi–3 at.%W/Ni–10 at.%Cr–1.5 at.%Al and Ni–5 at.% W/Ni–10 at.% W composite tapes. The buffer layer growth was studied in detail andrevealed good texture transfer throughout the structure, similar to standardNi–5 at.% Wsubstrates. YBCO layers were successfully deposited on the buffered tapes and compared to films grownon SrTiO3 single crystals. A superconducting transition temperature of about 90 K with a smalltransition width was observed on all metal substrates. A critical current densityJc ofabout 1 MA cm−2 was measured at 77 K in a self-field. It was found thatJc ismainly limited by the grain boundary network in magnetic fields below 4 T, whereas similar values ason SrTiO3 single crystals were measured at higher fields.