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

Ruben Hühne, J. Eickemeyer,  T. Thersleff, L. Schultz,
B. Holzapfel, O. de Haas, V. S. Sarma, M. Weigand, J. H. Durrell

Abstract — An epitaxial Y₂O₃/YSZ/CeO₂ buffer architecture has been grown using pulsed laser deposition on 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. The buffer layer growth was studied in detail using X-ray diffraction and EBSD measurements, showing a perfect texture transfer throughout the buffer architecture. Epitaxial YBCO layers were successfully deposited on the buffered tapes showing a superconducting transition temperature T_c of about 90 K with a small transition width on all metal substrates investigated. 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.

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