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

Abstract

We report a successful fabrication of high-Jc GdBa2Cu3O7−δ (GdBCO) films by the metal–organic deposition process on the LaAlO3 (LAO) (001) substrates. The coating solution was prepared by mixing Gd, Cu fluorine-free sources with Ba trifluoroacetate. Samples were dip-coated, pyrolized within 3h at the temperature up to 400°C in a humid oxygen atmosphere, and finally fired at various high temperatures in 100ppm Ar/O2 atmosphere. The GdBCO films fired at 775 and 800°C exhibited Jc values of ∼2.1MA/cm2 at 77K in a self-field, which are attributable to both high Tc,zero values of ∼89K 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 100ppm Ar/O2 atmosphere.