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VOLUME 61 (1995) | ISSUE 10 | PAGE 819
Nonlinear conductivity of Bi2Sr2CaCu2Ox whiskers near the superconducting transition
The resistance R has been measured as a function of the electric field Ε near the superconducting transition of Bi2Sr2CaCu20A. whiskers, in a region with R Φ 0. It is observed that R increases with increasing E. The shape of the R(E) curves changes in a qualitative way as the temperature is varied. Near the transition temperature Tc0, the curvature of the R(E) plot changes sign, and the nonlinear resistance R(E) — R(0) for a given current reaches a maximum. Above Tc0, the results are linked with a suppression of a fluctuation conductivity by the electric field; below Tc0, they are linked with an excitation of nonequi-librium 2D vortices by the current. © 7995 American Institute of Physics. Physics.