A-b Plane Aligned YBa2Cu3O7-x Thin Film Tapes

Transport properties of magnetic field/liquid assisted textured YBa2Cu3O7−x thick films

“…The transport properties of MFLAT Y123 thick films are similar to those reported for Y123 thin films deposited on polycrystalline substrates, which have J ct values between 10 3 and 10 4 A/cm 2 at 77 K, 0 T, 15,16 but are far below those reported for biaxially aligned Y123 films, where J ct Ͼ10 5 A/cm 2 at 77 K, 0 T. 7,8 Such observations can be attributed to the lack of azimuthal ordering of the in-plane a and b axes in uniaxially aligned films. Dimos et al 17,18 have shown that when in-plane misorientation angles exceed a few degrees between neighboring Y123 grains, their boundaries have the properties of Josephson weak links.…”

“…Magnetic alignment was demonstrated early on as an effective means of texturing Y123. 7,8 Such films exhibit excellent crystallographic orientation and high transport current densities ͑e.g., J ct Ͼ10 5 A/cm 2 at 77 K͒. 2 Melt texturing via melt-growth 3-5 or directional solidification 10,11 processes has also gained attention; however, both techniques have inherent limitations.…”

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.…”

Fabrication of cube textured Ni tapes by in situ thermal and magnetic annealing

“…In order to improve the in-plane orientation and thereby the current transport properties of YBCO film, the conditions of YBCO epitaxial growth on the metal substrate should be strictly controlled. This has brought the evolution of several processes, including the rolling assisted bi-axially textured substrate (RABiTS) [1,2], the ion-beam assisted deposition (IBAD) [3,4], the inclined substrate deposition (ISD) [5], and the ionbeam structure modification (ISM) [6]. Among the processes developed so far, the RABiTS technique has been considered as an effective way to make substrate on which buffer layers and superconducting layers could be stacked with low cost.…”