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The c-axis textured Sr1-xKxFe2As2 tapes produced by cold rolling andpost-annealing, could carry a high super-current over 2*104 A/cm2. However, themagnitude is far from its maximum, because of the current obstacles associatedwith various defects in the material. To predict the maximal transport criticalcurrent density, we modeled the current paths in a c-axis textured polycrystalas a three-dimensional flow network, and calculated the maximum flow with theFord-Fulkerson algorithm. It indicates that a much higher super-current ofabout 2*105 A/cm2 could be achieved in an ideal c-axis textured K-doped 122polycrystal. The dependences of transport Jc on density, content of invalidboundary and grain size and shape were also studied. The results imply that,over 30% of the grain boundaries in the reported c-axis textured Sr1-xKxFe2As2tapes may act as current obstacles, and the large ratio of width to thicknesswas expected to be the most favorable grain shape for high transport Jc inc-axis textured 122 superconducting tapes.

Calculation of the transport critical current density of c-axis textured 122 iron-based superconductors