High critical current densities of YBa2Cu3O7−x thin films on buffered technical substrates

Abstract

C -axis oriented YBa2Cu3O7−x (YBCO) thin films were deposited on polycrystalline metallic tapes buffered with yttria stabilized zirconia (YSZ). The in-plane alignment of the YSZ layers achieved by simultaneous ion bombardment of the growing film (ion beam assisted deposition) and of the postdeposited YBCO thin films was studied by x-ray diffraction as a function of the buffer layer thickness. A significant improvement of the in-plane texture, achieved for buffer layers exceeding a thickness of about 1.5 μm, resulted in high critical current densities above 106 A/cm2 of the YBCO films.

High-rate deposition of biaxially textured yttria-stabilized zirconia by dual magnetron oblique sputtering

“…The rocking curve of the ͑002͒ reflection had a FWHM of 20°, indicating a significant mosaic spread. 19 Films deposited with ␣ϭ45°displayed fourfold symmetry in the ͕111͖ azimuthal scan. The ͕111͖ reflection shows four strong peaks separated by 90°, with FWHM values of 23°, confirming strong in-plane texture.…”

“…Significant attention has focused on YSZ buffer layers on Ni-based alloys for YBa 2 Cu 3 O x ͑YBCO͒ superconductor wires. 19,21 YBCO/YSZ/hastelloy coated conductors with J c Ϸ10 6 A/cm 2 19,22 have been obtained; in this case, the in-plane misorientation, as measured by the full width at half maximum ͑FWHM͒ of the ͕202͖ azimuthal x-ray scan, was 14°. The ͓001͔ axis of the YSZ grains aligns normal to the substrate surface and the ͗111͘ or ͗110͘ axes along the ion beam direction.…”

“…[19][20][21] A biaxially textured YSZ buffer layer is first deposited by IBAD on the polycrystalline metal, with a 200-300 eV Ar ion beam typically incident at 56°from the substrate normal. Significant attention has focused on YSZ buffer layers on Ni-based alloys for YBa 2 Cu 3 O x ͑YBCO͒ superconductor wires.…”

Effect of CeO2 buffer layer thickness on the structures and properties of YBCO coated conductors

“…Because of the technical importance and fundamental interest in high-temperature superconductivity, a great deal of effort has been devoted to understand the mechanism of thin-film growth of the buffer layers and superconductor films deposited on metallic substrates. Buffer layers or textured template films are needed for deposition of biaxially aligned YBCO films on polycrystalline metallic substrates to overcome weak links and, therefore, to achieve high critical current density (J c ) [6,7].…”

In-plane aligned Pr6O11 buffer layers by ion-beam assisted pulsed laser deposition on metal substrates

“…Several groups have succeeded in depositing highly biaxially oriented yttria stabilized zirconia ͑YSZ͒ buffers. [4][5][6][7][8][9] In order to achieve a high critical current density over 10 6 A/cm 2 in subsequently deposited YBCO films an intermediate CeO 2 layer is used to avoid YBCO misorientations due to the high lattice mismatch between YSZ and YBCO. 10 In this letter, we show the feasibility of the ionbeam assisted deposition method to highly orientate Pr 6 O 11 buffer layers for YBCO deposition.…”