Abstract

The current-voltage characteristics of YBa2Cu3Ox thin films were measured in high magnetic fields with current densities up to 107A/cm2. In order to lighten the heating effects, pulsed currents with a width of 10~150µ.s were used. Magnetic fields up to 30T were applied using a pulsed magnet. Jumps in the I–V curve were observed. Such an instability was predicted by Larkin and Ovchinnikov and observed for low T c superconductors many years ago, and recently reported for YBa2Cu3Ox. It is shown, however, that this anomaly is more likely to be due to the self heating effect. The current-voltage characteristics below the anomaly was strongly nonlinear and obeyed a power law in a wide range.

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