TY - JOUR KW - Measurement KW - Pulse KW - Thin films KW - Film KW - Films KW - Thin KW - Thin film KW - Thin-film KW - Thin films KW - Ybacuo KW - Mechanism KW - Density KW - Current-density AU - Shiv K Gupta AU - Paul H Berdahl AU - Richard E Russo AU - Gabriel Briceño AU - Alex Zettl AB -

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.

AN - 35 BT - Physica C: Superconductivity DA - 02/1993 DO - 10.1016/0921-4534(93)90533-V IS - 3-4 LA - eng N1 -

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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.

PY - 1993 RP - Laser SP - 335 EP - 344 T2 - Physica C: Superconductivity TI - Pulse I-V characteristics measurement to study dissipation mechanism in epitaxial YBaCuO thin films at high current densities VL - 206 ER -