Journal
PHYSICAL REVIEW B
Volume 88, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.180101
Keywords
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Funding
- Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy
- Laboratory Directed Research and Development Fund of Oak Ridge National Laboratory
- U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division
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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.
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