High current YBa2Cu3O7−δ thick films on flexible nickel substrates with textured buffer layers

Abstract

High current YBa2Cu3O7−δ (YBCO) thick films on flexible nickel substrates with textured buffer layers were fabricated. Highly textured yttria-stabilized-zirconia buffer layers were deposited by using ion beam assisted deposition (IBAD). Pulsed laser deposited YBCO films were not only c-axis oriented with respect to the film surface but also strongly in-plane textured. The in-plane mosaic spread of YBCO films was ∼10°. A critical current density of 8×105 A/cm2 was obtained at 75 K and zero field for thin YBCO films. It was also demonstrated that thick YBCO films with a high critical current and excellent magnetic field dependence at liquid nitrogen temperature can be obtained on flexible nickel substrates by using the textured buffer layers. The result indicates that thick film technology in combination with IBAD buffer layers could be a viable method for fabricating YBCO tapes in long lengths.

Preparation and characterization of Y/sub 2/O/sub 3/ buffer layers and YBCO films on textured Ni tape

“…In order to control the inplane alignment of polycrystalline YBCO films, several techniques have been developed. Biaxially-aligned yttriastabilized zirconia (YSZ) buf€ier layers have been grown on polycrystalline Ni-based alloy tapes by ion-beam-assisted deposition (IBAD) [3], [4] We successfilly deposited biaxially-aligned Y~0 3 buffer layers on cube-textured Ni substrates by electron bean deposition. This technique easily produces the: YzO~ buffer layers, needing only control of the deposition pressure.…”

Influence of RollingTemperature on the PerfectionDegree of RecrystallizationCube Texture in Nickel

“…The value of the critical transport current of a superconductor was shown to depend on the perfection degree of its crystallographic texture, which, in turn, is controlled by the perfection degree of the cube texture of the nickel substrate (Wu et al, 1994;Goyal et al, 1996;*Corresponding author. Fax: (3432) 74 5244, e-mail: sokolov@imp.uran.ru Norton et al, 1996).…”

Fabrication of YBa2Cu3Oy Thin Films on Textured Buffer Layers grown by Plasma Beam Assisted Deposition

“…These applications, however, rely on the availability of high quality films on metallic substrates with high transport critical currents at 77 K. Recently, it has been shown that by depositing a YSZ buffer layer using an obliquely impinging ion-beam assisted deposition (IBAD) process, high J c YBCO thin films can be grown on polycrystalline metallic substrates (Iijima et al 1992;Reade et al 1992;Sonnenberg et al 1993;Wu et al 1994). The J c increase for these films is due to a biaxially aligned YSZ buffer layer produced by the IBAD process, resulting in a reduction of the weak links at high-angle grain boundaries in the subsequently grown YBCO films.…”