  Domain structures of 320 nm thin epitaxial films of ferroelectric PbTiO3
grown by MOCVD technique in identical conditions on SmScO3 and TbScO3
perovskite sub- strates have been investigated by Raman spectroscopy and
piezoresponse force microscopy techniques. Phonon frequency shifts and typical
domain structure motifs are discussed. The results reveal strikingly different
domain structure architecture: domain structures of the PbTiO3 film grown on
SmScO3 have dominantly a-domain orientation while strongly preferential
c-domain orientation was found in the PbTiO3 film grown on the TbScO3
substrate. Differences between the two cases are traced back to the
film-substrate lattice mismatch at the deposition temperature.
