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Cross-sectional observations of YBa2Cu3Oy/La0.7Ca0.3MnOz/YBa2Cu3Oy trilayered films on MgO (100) substrates were performed using transmission electron microscopy. Each layer grows epitaxially with crystal orientations of YBa2Cu3Oy(100)∥ La0.7Ca0.3MnOz(110) ∥ YBa2Cu3Oy(100)∥ MgO(010). The Mn—O—Mn bond is parallel to the Cu—O—Cu bond. A reactant is absent at the interfaces and the La0.7Ca0.3MnOz layer is continuous until a thickness of about 7 nm.
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Ohno et al. (1992) studied this question.
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