TY - JOUR
T1 - Nonlinear dielectric relaxation spectroscopy of antiferroelectric liquid crystals
AU - Kimura, Yasuyuki
AU - Hayakawa, Reinosuke
AU - Okabe, Nobuhiro
AU - Suzuki, Yoshiichi
N1 - Funding Information:
This work is partially supported by the Grant-in-Aid for Promotion of Scientific Research from the Ministry of Education, Science, Sports and Culture of Japan.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 1997
Y1 - 1997
N2 - The relaxation spectra of the linear and nonlinear dielectric constants of the antiferroelectric liquid crystals have been studied in their SmA, SmC* and SmCA* phases. In the SmA phase near the boundary to the SmC* or SmCA* phase, both the dielectric constants show a critical behavior due to the softening of the ferroelectric soft mode. In the SmC* phase, we obtain the third-order nonlinear spectrum of a higher-order Debye type with a negative increment, which corresponds to the ferroelectric Goldstone mode observed also in the linear spectrum. In the SmCA* phase, the antiferroelectric Goldstone mode is observed not in the linear spectrum, but in the third-order spectrum as a Debye-type relaxation with a positive increment. All these spectra can be analyzed in terms of simple phenomenological models.
AB - The relaxation spectra of the linear and nonlinear dielectric constants of the antiferroelectric liquid crystals have been studied in their SmA, SmC* and SmCA* phases. In the SmA phase near the boundary to the SmC* or SmCA* phase, both the dielectric constants show a critical behavior due to the softening of the ferroelectric soft mode. In the SmC* phase, we obtain the third-order nonlinear spectrum of a higher-order Debye type with a negative increment, which corresponds to the ferroelectric Goldstone mode observed also in the linear spectrum. In the SmCA* phase, the antiferroelectric Goldstone mode is observed not in the linear spectrum, but in the third-order spectrum as a Debye-type relaxation with a positive increment. All these spectra can be analyzed in terms of simple phenomenological models.
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U2 - 10.1080/10587259708046971
DO - 10.1080/10587259708046971
M3 - Article
AN - SCOPUS:5244235648
VL - 304
SP - 275
EP - 284
JO - Molecular Crystals and Liquid Crystals
JF - Molecular Crystals and Liquid Crystals
SN - 1542-1406
ER -