Origins of large enhancement in electromechanical coupling for nonpolar directions in ferroelectric BaTiO3


Journal Article

The origins of enhanced piezoelectric coupling along nonpolar crystallographic directions in ferroelectric BaTiO3 are investigated using in situ neutron spectroscopy. It is observed that an electric field applied away from the equilibrium polarization direction causes a stiffening of the transverse acoustic (TA) phonon branch and consequently increases interaction between the TA and the transverse optic soft mode for a range of wave vectors extending from the Brillouin zone center. This provides a direct lattice dynamics mechanism for enhanced electromechanical coupling, and could act as a guide for designing improved piezoelectric materials. © 2013 American Physical Society.

Full Text

Duke Authors

Cited Authors

  • Pramanick, A; Diallo, SO; Delaire, O; Calder, S; Christianson, AD; Wang, XL; Fernandez-Baca, JA

Published Date

  • November 15, 2013

Published In

Volume / Issue

  • 88 / 18

Electronic International Standard Serial Number (EISSN)

  • 1550-235X

International Standard Serial Number (ISSN)

  • 1098-0121

Digital Object Identifier (DOI)

  • 10.1103/PhysRevB.88.180101

Citation Source

  • Scopus