ENHANCEMENT OF CRITICAL-CURRENT DENSITY IN TL2BA2CACU2OY SUPERCONDUCTING THIN-FILM ON POLYCRYSTALLINE AL2O3 SUBSTRATES USING TEXTURED YSZ BUFFER LAYERS

Tl2Ba2CaCu2Oy superconducting thin films on polycrystalline Al2O3 subs trates with and without textured yttria-stabilized-zirconia(YSZ) or Ce O2/YSZ buffer layers were fabricated Ion beam-assisted laser depositio n was used to obtain the textured YSZ buffer layers. The Tl(2)Ba(2)CaC u2O(y), thin films grown on the YSZ buffer layers were highly c-axis o riented with respect to the film surface and strongly in plane texture d. The zero resistance temperature of these films was 100-108K. The cr itical current density (J(c)) of the films grown on the YSZ buffer lay ers was 10(5) A/cm(2). J(c) of the films grown on the CeO2/YSZ buffet layer or on Al2O3 substrates directly was less than 10(4) A/cm(2).