Voltage jumps in current-voltage characteristics of Bi2Sr2CaCu2O delta+delta superconducting films: Evidence for flux-flow instability under the influence of self-heating

摘要

We present the observation of voltage jumps at high flux-few velocities in current-voltage characteristics of c-axis-oriented Bi2Sr2CaCu2O8+delta superconducting thin films. The experimental results agree quantitatively with the prediction for viscous flux-how instability including consideration of a finite heat-removal rate from the samples. We obtained a characteristic magnetic field B-tau, which separates the regions where the instability is dominated by nonthermal and heating mechanisms. The inelastic scattering rate 1/tau(in) and the diffusion length l(e) of the quasiparticles have also been extracted. [References: 21]