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Updated: Aug 14, 2026

Piezoreflectance Spectroscopy of Optical Transitions in van der Waals Layered Crystals
Published on: May 22, 2026
Electromechanical properties of high coupling single crystals under large electric drive and uniaxial compression
1Sensors and Sonar Systems Department, Naval Undersea Warfare Center, Newport, RI 02841, USA. aminah@npt.nuwc.navy.mil
Abstract:
This work investigates the 33-mode electromechanical response of relaxor-ferroelectric lead magnesium niobate-lead titanate (PMN-PT) single crystals when driven with large fields approximately 0.4 MV/m under a combined direct current (DC) field and mechanical bias similar to those used in the design of sound projectors. It demonstrates that the remarkable small signal length extensional coupling (k33 > 0.90) and other electromechanical properties of morphotropic PMN-PT single crystals prevail under large drive. The observed k33 roll-off at 42 MPa compressive stress is analyzed in terms of the recent structural data and the high-order Devonshire theory of possible ferroelectric-ferroelectric transition trajectories.
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