Saturday, 3F-07, 9:30-9:40

Application of Textured Highly Alloyed Ni-W Tapes for Coated Conductor Architectures

Ruben Hühne

IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
Tel.: ++49-351-4659-716, Fax: ++49-351-4659-9716, e-mail: r.huehne@ifw-dresden.de

The development of cube textured substrates with improved mechanical strength and reduced ferromagnetism at low temperatures is a major challenge for the preparation of coated conductors using the RABITS approach. Recently, highly textured Ni-W tapes with W-contents above 5 at.% as well as composite tapes, having a non-ferromagnetic core with high yield strength and a highly textured shell material, were successfully prepared. An epitaxial Y₂O₃/YSZ/CeO₂ buffer architecture has been grown on these cube textured tapes using pulsed laser deposition. The buffer layer growth was studied in detail using X-ray diffraction and EBSD measurements, showing a perfect texture transfer throughout the buffer architecture. Afterwards, epitaxial YBCO layers were successfully deposited on the buffered tapes. The superconducting properties were measured and compared to films grown on SrTiO₃ single crystals. A superconducting transition temperature T_c of about 90 K with a small transition width was observed on all developed metal substrates. A critical current density J_c of about 1 MA/cm² was measured at 77 K in self-field. It was found that J_c is mainly limited by the grain boundary network in magnetic fields below 4 T, whereas similar values as on SrTiO₃ single crystals were measured at higher fields. Finally, the full anisotropy of Jc at various magnetic fields was determined for selected samples.

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