Fluctuation conductivity studies on Bi2Sr2CaCu2O8+δ film with varying applied currents

Abstract

Fluctuation conductivity studies were done on LPE-grown Bi₂Sr₂CaCu₂O_8+δ (Bi-2212) film under varying applied currents. Results indicate that the shifting in the observed critical temperature T_c with increasing current density may be attributed to the slowing down of thermally activated formation rate of the Cooper pairs. The experimentally obtained values of the resistance were plotted versus the scattering time (τ) and at sufficiently high currents, the total conductivity due to the pairs being formed were at a minimum. The greater the current density, the slower the rate the Cooper pairs form, and thus the resistance versus temperature (R vs. T) curves of the films are expected to be broader.