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Cryogenic Transmission Electron Microscopy of High Tc Ba-Yb-Cu Perovskite Oxide

A high-Tc superconductor Ba-Yb-Cu perovskite oxide was examined by a high resolution cryogenic transmission electron microscope. The result are compared with observations at room temperature. Lattice images of the superconducting layered perovskite were recorded in spite of expected disturbing Meissner effect. Anormalous changes in the diffraction spots and lattice images were recorded in some of the layered crystals. The change may reflect perturbations either in the lattice or local magnetic flux.