Giant negative electrostriction and dielectric tunability in a van der Waals layered ferroelectric

Abstract

The interest in ferroelectric van der Waals crystals arises from the potential to realize ultrathin ferroic systems owing to the reduced surface energy of these materials and the layered structure that allows for exfoliation. Here, we quantitatively unravel giant negative electrostriction of van der Waals layered copper indium thiophosphate (CIPS), which exhibits an electrostrictive coefficient Q33 as high as -3.2 m4/C2 and a resulting bulk piezoelectric coefficient d33 up to -85 pm/V. As a result, the electromechanical response of CIPS is comparable in magnitude to established perovskite ferroelectrics despite possessing a much smaller spontaneous polarization of only a few uC/cm2. In the paraelectric state, readily accessible owing to low transition temperatures, CIPS exhibits large dielectric tunability, similar to widely-used barium strontium titanate, and as a result both giant and continuously tunable electromechanical response. The persistence of electrostrictive and tunable responses in the paraelectric state indicates that even few layer films or nanoparticles will sustain significant electromechanical functionality, offsetting the inevitable suppression of ferroelectric properties in the nanoscale limit. These findings can likely be extended to other ferroelectric transition metal thiophosphates and (quasi-) two-dimensional materials and might facilitate the quest towards novel ultrathin functional devices incorporating electromechanical response.

Published version in Phys. Rev. Materials https://journals.aps.org/prmaterials/abstract/10.1103/PhysRevMaterials.3.024401

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• Cyclic Ferroelectric Switching and Quantized Charge Transport in CuInP${}_2$S${}_6$
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• Sliding-mediated ferroelectric phase transition in CuInP2S6 under pressure
• Anharmonic stabilization of ferrielectricity in CuInP${}_2$Se${}_6$
• Phenomenological description of bright domain walls in ferroelectric-antiferroelectric layered chalcogenides
• Time-dependent theory of optical electro- and magnetostriction
• Flexocoupling-induced phonons and ferrons in van der Waals ferroelectrics
• Deciphering the lattice vibrational behaviors of CuInP2S6 by angle-resolved polarized Raman scattering
• The Influence of Electric Field on the Anisotropic Dispersion of the Flexocoupling Induced Phonons and Ferrons in Van der Waals Ferrielectrics