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

被引:31
作者
Frary, M [1 ]
Schuh, CA [1 ]
机构
[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA
关键词
D O I
10.1063/1.1624490
中图分类号
O59 [应用物理学];
学科分类号
摘要
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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页码:3755 / 3757
页数:3
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