High-Jc GdBa2Cu3O7-δ films fabricated by the metal-organic deposition process

Abstract We report a successful fabrication of high- J c GdBa 2 Cu 3 O 7− δ (GdBCO) films by the metal–organic deposition process on the LaAlO 3 (LAO) (0 0 1) substrates. The coating solution was prepared by mixing Gd, Cu fluorine-free sources with Ba trifluoroacetate. Samples were dip-coated, pyrolized within 3 h at the temperature up to 400 °C in a humid oxygen atmosphere, and finally fired at various high temperatures in 100 ppm Ar/O 2 atmosphere. The GdBCO films fired at 775 and 800 °C exhibited J c values of ∼2.1 MA/cm 2 at 77 K in a self-field, which are attributable to both high T c ,zero values of ∼89 K and high in-plane textures of 1.3–1.4°. Above 800 °C, however, the superconducting properties of GdBCO films are degraded due to the thermal decomposition of GdBCO film in 100 ppm Ar/O 2 atmosphere.