Epitaxial ferroelectric PbTiO3/YBa2Cu3O7−x heterostructures have been fabricated on [001] LaAlO3 by pulsed laser ablation. X-ray diffractometer scans showed only the (00l) peaks from the lead titanate and YBa2Cu3O7−x film indicating c-axis growth. Transmission electron microscopy on planar and cross-sectional samples revealed a single domain film. The c-axis orientation in the lead titanate film is ascribed to the good lattice match of the a-axis of lead titanate with the a- or b-axes of the YBa2Cu3O7−x film. A cubic lead titanate film is deposited above the Curie point. Compressive stresses arise in the lead titanate film due to lattice mismatch. The c-axis orientation is favored since it reduces the compressive residual stresses.
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Ghonge et al. (1993) studied this question.
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