The Incommensurate Metastable Phase, Nonequilibrium Processes and Memory Effect in the Ferroelectric NH4HSeO4

Abstract
The instability of the incommensurate phase in NH4HSeO4 was revealed using 77Se high resolution NMR. The nonequilibrium processes accompaning the long-range order destruciton and memory effect were investigated using both NMR and dielectric measurements. The three-dimensional version of the topological phase transition accounting the interaction of three-dimensional solitons with the point defect is developed to explain the experimental data.

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