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29 March 2024 |
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Observation of Kibble-Zurek behavior near the Lifshitz point in ferroelectrics with incommensurate phase | K.Z. Rushchanskii
; A. Molnar
; R. Bilanych
; R. Yevych
; A. Kohutych
; Yu.M. Vysochanskii
; V. Samulionis
; J. Banys
; | Date: |
23 Sep 2014 | Abstract: | We have investigated non-equilibrium properties of proper uniaxial
Sn$_2$P$_2$(Se$_x$S$_{1-x}$)$_6$ ferroelectrics with the Type II incommensurate
phase above Lifshitz point $x_{
m LP} sim 0.28$. We measured dielectric
susceptibility with cooling and heating rate ranging 0.002-0.1~K/min, and
high-resolution ultrasound experiments and hypersound Brillouin scattering. For
samples with $x geqslant 0.28$ clear anomalies were observed at incommensurate
second order transition ($T_i$) and at first order lock-in transition ($T_c$)
in the regime of very slow cooling rate, whereas the intermediate IC phase is
not observed when the rate is faster then 0.1~K/min. In general, increasing the
cooling rate leads to smearing the anomaly at $T_c$. We explain this effect in
terms of Kibble-Zurek model for non-equilibrium second order phase transitions.
In the ferroelectrics with strongly nonlinear local potential cooling rate
defines concentration of domain walls and their size: domain width decreases
when cooling rate increases. At certain conditions the size of domain is
comparable to the incommensurate phase modulation period, which lies in
micrometer scale in the vicinity of Lifshitz point and leads to pinning of the
modulation period by domain wall. | Source: | arXiv, 1409.6364 | Services: | Forum | Review | PDF | Favorites |
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