Nonlinear dynamics of ferroelectrics with three-well local potential

Abstract

For Sn${}_2$P${}_2$S${}_6$ ferroelectrics, the appearance of spontaneous polarization is related to stereoactivity of tin cations and valence fluctuations of phosphorous cations. Here, the continuous phase transition and its behavior under pressure is determined by thee-well local potential and can be described in an anharmonic quantum oscillator model. For such a model, the spectrum of pseudospin fluctuations at different temperatures and pressures has been calculated and compared with the data of Raman spectroscopy. It was revealed that the ferroelectric lattice instability is related to several low energy optic modes.

arXiv comment8 pages, 8 figures

References in corpus (4)

• From band insulator to Mott insulator in one dimension
• Valence fluctuations in Sn(Pb)${}_2$P${}_2$S${}_6$ ferroelectrics
• Strong-Coupling Theory of Rattling-Induced Superconductivity
• Observation of Kibble-Zurek behavior near the Lifshitz point in ferroelectrics with incommensurate phase

Cited by in corpus (6)

• Enhancing the dielectric, electrocaloric and energy storage properties of lead-free Ba0.85Ca0.15Zr0.1Ti0.9O3 ceramics prepared via sol-gel process
• Quantum paraelectric state and critical behavior in Sn(Pb)${}_2$P${}_2$S(Se)${}_6$ ferroelectrics
• Phase diagram of ferroelectrics with tricritical and Lifshitz points at coupling between polar and antipolar fluctuations
• Description of lattice anharmonicity observed in ferroelectrics with unusual three-well local potential
• Slow and fast relaxation times of quantum lattice model with local multi-well potentials: phenomenological dynamics for Sn${}_2$P${}_2$S${}_6$ ferroelectric crystals
• Description of CuInP${}_2$S${}_6$ ferrielectrics in a mixed Ising model