Deposition of large area YBa2Cu3O7 superconducting films by laser scanning ablation

A method of laser scanning ablation for producing large area YBa2Cu3O7 superconducting films is presented. Uniformly thick, large area YBa2Cu3O7 superconducting films were obtained on 36-mm-diam (100) LaAlO3 substrates with a lens rotating radius of 9 mm. The Tc’s of the film center and edge were all 92 K and transition widths were less than 1 K. X-ray diffraction studies showed complete c-axis orientation of the films. The critical current density of 3.6×106 A/cm2 in zero field was measured at 77 K. A power law of voltage V versus current I of the YBa2Cu3O7 superconducting microbridge, V=1.363×10−32I11.224 49 was achieved.