Tl 2Ba 2CaCu 2O y superconducting thin films on polycrystalline Al 2O 3 substrates with textured YSZ buffer layers

Abstract

We report for the first time the successful fabrication of Tl 2Ba 2CaCu 2O y superconducting thin films on polycrystalline Al 2O 3 substrates using yttria-stabilized-zirconia (YSZ) buffer layers. Ion beam-assisted laser deposition was used to obtain the textured YSZ buffer layers. The Tl 2Ba 2CaCu 2O y thin films were shiny, highly c-axis oriented with respect to the film surface and strongly in plane textured. The zero resistance temperature of these films was as high as 108 K with a critical current density of ∼ 10 5 A/cm 2 at 77 K.