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