- Polar Coincident Site Lattice Figure -:Multiple Domain Growth of Bismuth Cuprate Superconducting Film

概要

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Bismuth cuprate superconducting film has a large-scale periodicity, supercell, other than an ordinal lattice cell. Although the supercell lies along b axis in bulk material, the structure lies along both a and b axes on thin film and shows asymmetric structure in reciprocal space along c axis. The asymmetric structure was described with triangle function, which modulates the structure to form the supercell. In the terms of the double domain along a and b axes were observed on three dimension X-ray reciprocal space mapping. Bismuth oxide film (Bi2Sr2Ca1Cu2OX) grew with the relation of Bi-2212[001] parallel to MgO[110] (45° rotation growth), but the bismuth cuprate superconducting film often grows with lateral rotation from 45° growth. To describe such a relation, coincidence site lattice was visually expressed on polar coordinate system.
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