Tin-oxides were doped into YBCO films as pinning centers to improve J c properties in a magnetic field. YBCO films were grown by a metal organic deposition process using tri-fluoroacetates starting solutions which contains tin compounds such as SnO2 particles or tin-acetylacetonate salts for pinning centers. Jc of the YBCO films were enhanced by introducing pinning centers both SnO2 and tin-acetylacetonates in the wide range of the magnetic angle. Especially, Jc of YBCO film grown by the solution with tin-acetylacetnates increased in all magnetic field angles. XRD analysis and TEM observation revealed the existence of BaSnO3 particles with the size of about 30 nm in the YBCO film grown by the solution with tin-acetylacetnates. The BaSnO3 nano particles were distributed randomly in the film and were considered to act as 3-dimentional pinning centers.
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