2D and 3D percolation in high-temperature superconductors
E. D. Specht, A. Goyal, D. M. Kroeger
DOI 10.1103/PhysRevB.53.3585 · Physical Review B
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Abstract
A quantitative model is presented for the high critical current densities (Jc) supported by superconducting materials with uniaxial alignment, such as c-axis textured Bi-Sr-Ca-Cu-O tapes. Current follows percolative paths across small-angle grain boundaries. Because jc is low for intragranular conduction parallel to the c axis, the 3D flow required for percolation is produced by conduction perpendicular to the c axis in tilted grains. For optimized microstructures, Jc ranging from 3 to 30 % of the intragranular value is predicted for percolation across small-angle grain boundaries with misorientations below 10° and 20°, respectively. © 1996 The American Physical Society.
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