|Title||Pulse I-V characteristics measurement to study dissipation mechanism in epitaxial YBaCuO thin films at hihg current densities|
|Publication Type||Journal Article|
|Year of Publication||1993|
|Authors||Gupta, Shiv K., Paul Berdahl, Richard E. Russo, Gabriel Briceño, and Alex Zettl|
|Secondary Title||Physica C: Superconductivity|
|Keywords||current-density, density, film, films, measurement, mechanism, pulse, thin, thin film, thin films, thin-film, thin-films, ybacuo|
A simple pulse method of measuring current-voltage characteristics (I-V) at high current densities is described. We report I-Vs on epitaxial YBa2Cu3Ox thin films at high current densities in the presence of a magnetic field parallel to the c-axis. The results show that the Bardeen-Stephen flux flow model does not account for dissipation at high current densities in YBa2Cu3Ox thin films. In the presence of a magnetic field, we find qualitative agreement with a simple theoretical model based on dissipation caused by 2D vortices excited from the flux lines. In the absence of a magnetic field, a power law behavior arises due to current-induced depairing of thermally excited 2D vortices.
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