YBa₂Cu₃O7-x Thin Film Prepared by Laser Ablation

High critical current density YBa 2 Cu 3 O 7- x thin films on (100)SrTiO 3 were successfully prepared by laser ablation. The zero resistance transition temperature ( T c ( R =0)) was 90.5 K and the critical current density ( J c ) at 77.3 K was 8.0×10 6 A/cm 2 under a zero magnetic field. J c degraded to 1.7×10 4 A/cm 2 in a magnetic field of 8 T parallel to the c -axis of the film, and to 4.0×10 5 A/cm 2 in a magnetic field of 8 T perpendicular to the c -axis of the film. The characteristics of the film, mis-oriented crystallites and stacking faults, were revealed by transmission electron microscopy (TEM).