Piezoelectricity in the dielectric component of nanoscale dielectric-ferroelectric superlattices.
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.
Jo
Ji Young
JY
Department of Materials Science and Engineering and Materials Science Program, University of Wisconsin, Madison, Wisconsin 53706, USA.
Sichel
Rebecca J
RJ
Lee
Ho Nyung
HN
Nakhmanson
Serge M
SM
Dufresne
Eric M
EM
Evans
Paul G
PG