|Title||Nonrandom percolation behavior of grain boundary networks in high-T-c superconductors|
|Publication Type||Journal Article|
|Year of Publication||2003|
|Authors||Frary, M, Schuh, CA|
|Journal||Applied Physics Letters|
|Pagination||3755 - 3757|
The grain boundary networks of tetragonal and orthorhombic superconductors are shown to be nonrandom through computer simulations of polycrystalline structures. For biaxially textured microstructures, the distribution of low-angle grain boundaries around triple junctions is measurably deviant from the expectations for a randomly constructed lattice. Percolation thresholds are calculated for the unhindered flow of superconducting current through a polycrystal, and are found to be significantly different from the standard random percolation threshold in two dimensions. These deviations are explained as a result of crystallographic constraints on the network topology. (C) 2003 American Institute of Physics.