Flux-flow of Abrikosov-Josephson Vortices in Bi-2223 Superconducting Ceramics
We report a method for characterizing the electric transport through the intragranualar defects in two main directions of a superconducting sample. The main experimental data, the I-V curves, were taken on Bi-2223 samples at 90 K and low applied magnetic fields (Ha < 39:8 kA/m), and analyzed by using a flux flow model proposed by A. Gurevich. The model allows determining the lower and upper critical field of the large Josephson junctions due to the presence of planar defects inside the grains. The obtained results reveal certain anisotropy in the electric transport properties and an increase of the critical fields associated to currents through the planar defects with increasing compacting pressures.
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