Mixed-state behavior in large magnetic fields of high-temperature superconducting films prepared by metalorganic deposition

Films of Ba2YCu3O7-x prepared by metalorganic deposition (MOD) are demonstrated to have large critical current densities in high magnetic fields. The current-voltage (I-V) characteristics are reported for an MOD film in applied fields from 0 to 6 T at 77 K. The zero field critical current density was 600 000 A/cm2 and fell to 60 000 A/cm2 at 1 T. The critical current is approximately proportional to 1/H1/2. The variation in I-V curves above the critical current indicates the voltage has a power law behavior with values for the current exponent varying from 5.2 to 1.7 for magnetic fields from 0 to 6 T