Introduction of BaHfO₃ Nano Particle Pinning Centers in YBa₂Cu₃O_y Films by Metal Organic Deposition

Abstract

YBa₂Cu₃O_y (YBCO) films with BaHfO₃ (BHO) nanoparticles were fabricated by a metal organic deposition (MOD) method using a solution with trifluoroacetates and Hf salts. X-ray diffraction (XRD) revealed the formation of BHO in highly oriented YBCO film, and scanning transmission electron microscopy (STEM) with energy dispersive X-ray spectroscopy (EDS) showed the elemental distributions of Y, Cu, Ba, Hf and O in the film. The average size of BHO in the film was about 18 nm. Critical current density (J_c) properties of the films with BHO were higher than those of the films with BaZrO₃ in magnetic fields.