Abstract
The numerical analysis based on the two-dimensional weak link network model is carried out to investigate the influence of the microscopic inhomogeneities on $I\ensuremath{-}V$ characteristics of the Ag/Bi2223 tapes. The dependence of $I\ensuremath{-}V$ curves on the various parameters of the model (system size, effective coordination number, volume fraction, and connectivity) is calculated and statistical matters are discussed. It is revealed that the lattices having larger coordination number Z show better properties and volume fraction of superconducting (SC) phase is very important to have finite (nonzero) ${I}_{\mathrm{c}}.$ This indicates that it is very effective for improving the properties of the tapes to fabricate the tapes consisting of large Z grains and having high volume fraction of SC phase.
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