Piezoelectricity in the dielectric component of nanoscale dielectric/ferroelectric superlattices

Details Piezoelectricity in the dielectric component of nanoscale dielectric/ferroelectric superlattices Piezoelectricity in the dielectric component of nanoscale dielectric/ferroelectric superlattices

2010-05-09

arxiv.org/abs/1005.1430v1

Physics

Condensed Matter

Materials Science

4 figures

Scientific paper

The origin of the functional properties of complex oxide superlattices can be resolved using time-resolved synchrotron x-ray diffraction into contributions from the component layers making up the repeating unit. The CaTiO3 layers of a CaTiO3/BaTiO3 superlattice have a piezoelectric response to an applied electric field, consistent with a large continuous polarization throughout the superlattice. The overall piezoelectric coefficient at large strains, 54 pm/V, agrees with first-principles predictions in which a tetragonal symmetry is imposed on the superlattice by the SrTiO3 substrate.

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