Stress-Induced Phase Transitions in Nanoscale CuInP${}_2$S${}_6$

Abstract

Using Landau-Ginsburg-Devonshire approach and available experimental results we reconstruct the thermodynamic potential of the layered ferroelectric CuInP${}_2$S${}_6$ (CIPS), which is expected to be applicable a wide range of temperatures and applied pressures. The analysis of temperature dependences of the dielectric permittivity and lattice constants for different applied pressures unexpectedly reveals the critically important role of the nonlinear electrostriction in this material. With the nonlinear electrostriction included we calculated temperature and pressure phase diagrams and spontaneous polarization of bulk CIPS. Using the coefficients of the reconstructed four-well thermodynamic potential, we study the strain-induced phase transitions in thin epitaxial CIPS films, as well as the stress-induced phase transitions in CIPS nanoparticles, which shape varies from prolate needles to oblate disks. We reveal the strong influence of the mismatch strain, elastic stress and shape anisotropy on the polar properties and phase diagrams of nanoscale CIPS. Also, we derived analytical expressions, which allow the elastic control of the nanoscale CIPS polar properties. Hence obtained results can be of particular interest for the strain-engineering of nanoscale layered nanoferroelectrics.

23 pages including 6 figures and 2 appendixes

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Cited by in corpus (7)

• Disentangling stress and curvature effects in layered 2D ferroelectric CuInP2S6
• Pressure-driven phase transformations and phase segregation in ferrielectric CuInP${}_2$S${}_6$-In${}_{4/3}$P${}_2$S${}_6$ self-assembled heterostructures
• Stress-Induced Transformations of Polarization Switching in CuInP${}_2$S${}_6$ Nanoparticles
• Flexocoupling-induced phonons and ferrons in van der Waals ferroelectrics
• Strong coupling between coherent ferrons and cavity acoustic phonons
• The Influence of Electric Field on the Anisotropic Dispersion of the Flexocoupling Induced Phonons and Ferrons in Van der Waals Ferrielectrics
• Pressure-Driven Structural Phase Competition and Functional Response in Layered LiInP2S6