4.6 Article

Nonrandom percolation behavior of grain boundary networks in high-Tc superconductors

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APPLIED PHYSICS LETTERS
卷 83, 期 18, 页码 3755-3757

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AMER INST PHYSICS
DOI: 10.1063/1.1624490

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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.

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