Abstract
LiNbO3(LN)/LiTaO3(LT) superlattice thin films are fabricated by the pulsed laser deposition method with several LT/(LN+LT) ratios including LN and LT mono-layered films. These films are found to be epitaxial and have clear superlattice structure by x-ray diffraction technique with both in-plane and out-of-plane configurations. However, SHG microscopic observations of these films reveal that the point group symmetry is monoclinic m, different from 3 m of LN and LT bulk crystals.
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