Epitaxial YBa2Cu3O7-x (YBCO) films with critical current densities exceeding 1 MA cm-2 (at 77 K in self magnetic field) were epitaxially grown on biaxially textured Ni 5 at% W (Ni-W) substrate using only a CeO2 buffer layer. Both YBCO and CeO2 films were deposited in situ by pulsed laser ablation. The oxidation behaviour of the Ni-W substrate enables the epitaxial growth of a CeO2 oxide buffer layer without using the forming gas (Ar 4%H2). SEM investigations of YBCO and CeO2 films reveal a dense microstructure without cracks or porosity. X-ray pole figures show a cube-on-cube epitaxy with a YBCO//CeO2//Ni-W epitaxial relationship. The YBCO superconducting film has a good out-of-plane and in-plane texture with a full-width-half-maximum of 5.8° and 6.6°, respectively. No severe degradation of JC with film thickness, up to 1 μm thick films, was observed. The use of a single buffer layer on Ni-W substrates represents an important simplification in the scaling-up for long tape fabrication.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy (miscellaneous)
- Condensed Matter Physics
Varesi, E., Celentano, G., Petrisor, T., Boffa, V., Ciontea, L., Galluzzi, V., Gambardella, U., Mancini, A., Rufoloni, A., & Vannozzi, A. (2003). Pulsed laser deposition of high critical current density YBa. Superconductor Science and Technology, 16(4), 498 - 505. https://doi.org/10.1088/0953-2048/16/4/313