Low Field Flux Flow Resistivity in Bi sub (2.2) Sr sub 2 Ca sub (0.8) Cu sub 2 O sub (8+delta) .

We have examined the transport properties of single crystals of the 84K superconducting phase, Bi sub (2.2) Sr sub 2 Ca sub (0.8) Cu sub 2 O sub (8+delta) , in the low field regime. We had previously observed high critical current densities in zero applied magnetic field, but a large field dependence is observed. We report here the lack of threshold behavior in the I-V characteristics measured in the finite applied fields and universal behavior in the low field flux flow resistivity. By closely analyzing the behavior of the flux flow resistivity it is possible to infer some basic properties of the superconductor. These observations reflect the intrinsic behavior of Bi sub (2.2) Sr sub 2 Ca sub (0.8) Cu sub 3 O sub (8+delta) , and thus have crucial implications for technological applications of this material.