High electric field transport of the epitaxial YBaCuO thin films

The hole-carrier transport in the epitaxial (001) Y1Ba2Cu3Oy thin films has been closely investigated under the application of pulsed high electric field. In every current-electric field curve of the normal conduction, strong nonlinearity appeared: currents no longer increased as the electric field increased in excess of certain threshold values. Observed current saturation was much more exaggerated with increasing low-field mobility (at lower temperatures or better quality films). These new phenomena of the high temperature superconductors are very similar to the hot-carrier transport well-known in the semiconducting materials. In the paper, comparisons concerning the threshold field intensity, electron temperatures and so on between the oxide superconductors and the typical semiconductors