Magnetic properties of laser deposited films of Y-Ba-Cu-O

Films of YBa2Cu3O7-x prepared by laser ablation deposition show epitaxial growth on (100) SrTiO3 substrates with the c axis perpendicular to the plane of the film. With the magnetic field (H) parallel to the c axis, critical currents of up to 40 MA/cm2 from magnetization measurements are obtained. With H perpendicular to the c axis, various magnetization measurements with field cooling in 40 kOe indicated strong pinning effects with a calculated critical current density significantly higher than that observed in the parallel field configuration.