(La,Sr)TiO/sub 3/ as a conductive buffer for high-temperature superconducting coated conductors

The perovskite (La,Sr)TiO/sub 3/ was investigated as a possible conducting oxide buffer layer for high-temperature superconducting coated conductors. In particular, the growth of LSTO films on SrTiO/sub 3/ single crystal, Ni-W, and Cu tapes was performed using pulsed laser deposition. LSTO films were grown in vacuum at a temperature of 750/spl deg/C. From the /spl omega/-scan, the FWHM values of LSTO (004) on Ni-W and Cu tape were 7.48/spl deg/ and 6.21/spl deg/, which showed improvement in the out-of-plane texture for the film as compared to the substrate metal tapes. The /spl phi/-scans through the LSTO (112) on both metal tapes indicated in-plane-aligned LSTO grains. YBa/sub 2/Cu/sub 3/O/sub 7/ films were deposited on all three structures by pulsed laser ablation; samples on LSTO/SrTiO/sub 3/ single crystals had a superconducting transition of 91/spl deg/K and a Jc value of 3.0 MA/cm/sup 2/. This shows that LSTO is a good template for the YBCO film in terms of epitaxial and chemically stable growth.