Critical-current measurements in epitaxial films of YBa2Cu3O7-x compound

We have grown epitaxial films of the YBa2Cu3O7-x compound on SrTiO3 substrates. The superconducting critical current in these films at 77 K is in excess of 105 A/cm2 and at 4.2 K in excess of 106 A/cm2. © 1987 The American Physical Society.