Title :
(La,Sr)TiO3 as a conductive buffer for high-temperature superconducting coated conductors
Author :
Kim, Kyunghoon ; Norton, David P. ; Cantoni, Claudia ; Aytug, Tolga ; Gapud, Albert A. ; Paranthaman, Mariappan P. ; Goyal, Amit ; Christen, David K.
Author_Institution :
Dept. of Mater. Sci. & Eng., Univ. of Florida, Gainesville, FL, USA
fDate :
6/1/2005 12:00:00 AM
Abstract :
The perovskite (La,Sr)TiO3 was investigated as a possible conducting oxide buffer layer for high-temperature superconducting coated conductors. In particular, the growth of LSTO films on SrTiO3 single crystal, Ni-W, and Cu tapes was performed using pulsed laser deposition. LSTO films were grown in vacuum at a temperature of 750°C. From the ω-scan, the FWHM values of LSTO (004) on Ni-W and Cu tape were 7.48° and 6.21°, which showed improvement in the out-of-plane texture for the film as compared to the substrate metal tapes. The φ-scans through the LSTO (112) on both metal tapes indicated in-plane-aligned LSTO grains. YBa2Cu3O7 films were deposited on all three structures by pulsed laser ablation; samples on LSTO/SrTiO3 single crystals had a superconducting transition of 91°K and a Jc value of 3.0 MA/cm2. This shows that LSTO is a good template for the YBCO film in terms of epitaxial and chemically stable growth.
Keywords :
barium compounds; buffer layers; conductors (electric); epitaxial growth; high-temperature superconductors; lanthanum compounds; pulsed laser deposition; strontium compounds; superconducting tapes; superconducting transitions; titanium compounds; yttrium compounds; 750 C; 91 K; FWHM values; LSTO films; LSTO grains; LaTiO3; Ni-W; SrTiO3; YBa2Cu3O7; chemically stable growth; conducting oxides; conductive buffer layer; epitaxial stable growth; high temperature superconducting coated conductors; oxide buffer layer; perovskite; pulsed laser ablation; pulsed laser deposition; substrate metal tapes; superconducting transition; Buffer layers; Conductors; High temperature superconductors; Laser ablation; Laser transitions; Optical pulses; Pulsed laser deposition; Substrates; Superconducting epitaxial layers; Superconducting films; Conducting oxides; conductive buffer layer; pulsed laser deposition; superconductors; thin films;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2005.848699
