Abstract
Planar defects in the infinite-layer (Sr 1− x Ca x ) y CuO 2 structure are believed to be responsible for superconductivity with T c up to 110 K. In this work we present χ 2 minimization results to best fit a set of through-focal HREM images of such defects. Optimized atomic positions of the defect with an error bar of about 0.1Åare determined. The experimental parameters for simulated defect images such as sample thickness and objective lens defocus are determined by χ 2 fitting of the corresponding experimental HREM images of the matrix.
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