Dynamic relaxation process of a 3D super crystal structure in a Cu:KTN crystal

Abstract

In this Letter, we report the existence and relaxation properties of a critical phenomenon on called a 3D super crystal that emerges at T = T C − 3.5°C, that is, in the proximity of the Curie temperature of a Cu:KTN sample. The dynamics processes of a 3D super crystal manifest in its formation containing polarized nanometric regions and/or polarized clusters. However, with strong coupling and interaction of microcomponents, the characteristic relaxation time measured by dynamic light scattering demonstrates a fully new relaxation mechanism with a much longer relaxation time. As the relaxation mechanism of a relaxator is so-far undetermined, this research provides a novel perspective. These results can help structure a fundamental theory of ferroelectric relaxation.

Anomalous Optical Properties of KTN:Li Ferroelectric Supercrystals

“…Ferroelectric KTN:Li cooled to its room-temperature phase transition manifests a ferroelectric supercrystal (SC) [1][2][3][4][5][6][7][8], a complex orderly multidomain state with the potential to provide hereto unavailable functionalities in key applicative scenarios, such as for energy and information storage [9][10][11][12]. One model of the SC is that of a volume lattice of 3D spontaneous polarization vortices (see, for example, Ref.…”

Evidence of hyperdimensional topological defects in a ferroelectric supercrystal phase-transition

“…Results can be discussed starting from the explanatory model of ferroelectric supercrystals (SC), a mosaic of ferroelectric domains that can form as a perovskite undergoes its ferroelectric phase-transition [23,[26][27][28][29][30]. Consider the formation of ferroelectric topological defects arising from planar-polarized (2D) domains, that is, where the spontaneous polarization field at each point in space r i is a constant-amplitude field oriented only parallel or antiparallel to the two principal axes, P(r i ) ∈ {±P x, ±P ŷ}, (xy-discrete-strain-model) [31].…”