title: Nonlinear piezoelectricity in epitaxial ferroelectrics at high electric fields.
abstract: Nonlinear effects in the coupling of polarization with elastic strain have been predicted to occur in ferroelectric materials subjected to high electric fields. Such predictions are tested here for a PbZr0.2Ti0.8O3 ferroelectric thin film at electric fields in the range of several hundred MV/m and strains reaching up to 2.7%. The piezoelectric strain exceeds predictions based on constant piezoelectric coefficients at electric fields from approximately 200 to 400 MV/m, which is consistent with a nonlinear effect predicted to occur at corresponding piezoelectric distortions.
authors.affiliation: Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706, USA.
authors.forename: Alexei
authors.initials: A
authors.lastname: Grigoriev
authors.forename: Rebecca
authors.initials: R
authors.lastname: Sichel
authors.forename: Ho Nyung
authors.initials: HN
authors.lastname: Lee
authors.forename: Eric C
authors.initials: EC
authors.lastname: Landahl
authors.forename: Bernhard
authors.initials: B
authors.lastname: Adams
authors.forename: Eric M
authors.initials: EM
authors.lastname: Dufresne
authors.forename: Paul G
authors.initials: PG
authors.lastname: Evans