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10 August 1994 Current-induced switching of epitaxial YBaCuO films into a dissipative state
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c-axis oriented YBa2Cu3Ox narrow films submitted to pulses of supercritical current show the phenomenon formerly observed on aluminum filaments by Pals et Wolter. The transition to a dissipative state is delayed by a long time td which is found to be independent of both the magnetic field (up 5 kG), of the temperature (up to at least 40 K), but to vary strongly with the ratio I/Ic, where Ic is the critical current. Our values of td, measured from 1 to 500 nanoseconds, fit approximately the time of extinction of the order parameter expected from the 1D Ginzburg-Landau equation. The rise of voltage at td differs from a heating process in several respects. The most striking is the memory effect obtain when applying a subcritical current pulse prior to the supercritical pulse. Another feature of the experiment is the identification of the initial voltage causing the acceleration of the superconducting pairs. The resistance reached after td corresponds to an extension of approximately equals 3 micrometers for the phase-slip center. If this can be identified with twice the quasiparticle diffusion length, the inelastic electron lifetime turns out to be a few nanoseconds, in agreement with the electron cooling time measured independently.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jean-Paul Maneval, Jean-Claude Villegier, and Fahd Salim Jelila "Current-induced switching of epitaxial YBaCuO films into a dissipative state", Proc. SPIE 2158, Oxide Superconductor Physics and Nano-Engineering, (10 August 1994);


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