Strong enhancement flux pinning in MOD-YBa2Cu3O7−x films with self-assembled BaTiO3 nanocolumns

YBCO thin films with BaTiO3 nanocolumns were fabricated on (0 0 l) oriented LaAlO3 substrates by metal-organic deposition (MOD). High critical current density (Jc) up to 10 MA/cm2 has been observed on these self-assembled BaTiO3 nanocolumns doped YBCO films at 77 K and self-field. These BaTiO3 nanocolumns had no preferential orientation and were distributed randomly in the YBCO matrix. And an improved critical current density over a wide range of magnetic field in the BaTiO3-YBCO composite films were found, which implies that this unique self-assembled microstructure provided strong vortex pinning in YBCO films.