<title>In-situ laser deposition of superconducting thin films on metallic substrate</title>

Abstract

C-axis oriented superconducting YBCO thin films on Hastelloy (Ni-Cr-Mo alloys) with yttria-stabilized zirconia (YSZ) buffer layers were fabricated by in situ pulsed laser deposition in a multitarget processing chamber. Generally, it is difficult to make films on flexible metallic substrates due to inherent interdiffusion problems between metallic substrates and superconducting overlayers. To overcome this difficulty, it is necessary to use YSZ buffer layers since it will not only limit the interdiffusion process but also minimize the surface microcrack formation due to smaller mismatch between the film and the substrate. In order to enhance the crystallinity and the transport properties of YBCO films on metallic substrates, YSZ buffer layers were grown at various temperatures different with the deposition temperature to grow YBCO films. On YSZ buffer layer grown at higher temperature than that for YBCO film, the YBCO thin film was found to be textured with c-axis orientation by x-ray diffraction and had a high zero- resistance critical temperature of 85 K. Critical current density for this film at 77 K was 4.7 X J/cm2.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.