Fabrication and properties of epitaxial buffer layers on nonmagnetic textured Ni based alloy substrates

Biaxially aligned YBCO thick films on oxide buffered metallic substrates is a promising route toward the fabrication of superconducting tapes operatin g at liquid nitrogen temperature. The role of buffer layer is to reduce the lattice mismatch between the substrate and the YBCO film, to adapt the the rmal expansion coefficient, to hamper the diffusion of Ni in YBCO film and to prevent the oxidation of the metallic substrate surface. This paper pres ents a study regarding CeO2 buffer layer deposition on a new nonmagnetic (0 01)[100] textured Ni-V alloy substrates. The deposition of CeO2 was perform ed by both pulsed laser ablation and e-beam evaporation techniques. The the ta-2 theta X-ray diffraction pattern mainly exhibits the (001) peaks of CeO 2, indicating that the films are epitaxially grown with the c axis perpendi cular to the substrate. Rocking curves through the CeO2 (002) peak have a F WHM of about 6 degrees. The SEM studies have shown that the surface is smoo th, continuos and free of cracks. Texture analysis reveals a good in-plane orientation for the ablated CeO2 film, whereas the electron beam evaporated CeO2 shows two textures in the growth plane. Further efforts are focused o n the deposition of YBCO thick film on the as buffered nonmagnetic metallic substrate.