Nonlinear dielectric relaxation spectroscopy of the antiferroelectric liquid crystal 4-(1-trifluoromethyl-pheptyloxycarbonyl) phenyl [Formula Presented]-octyloxybiphenyl-4-carboxylate

Yasuyuki Kimura, Reinosuke Hayakawa, Nobuhiro Okabe, Yoshiichi Suzuki

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29 Citations (Scopus)

Abstract

The linear and third-order nonlinear dielectric constants of the antiferroelectric liquid crystal 4-(1-trifluoromethyl-pheptyloxycarbonyl) phenyl [Formula Presented]-octyloxybiphenyl-4-carboxylate were experimentally studied in its smectic-A (Sm-A) and smectic-[Formula Presented] (Sm-[Formula Presented]) phases. Both dielectric constants showed a critical behavior near the Sm-A–Sm-[Formula Presented] phase transition corresponding to the softening of ferroelectric soft mode and the increase of the fluctuation in the tilt direction. In the Sm-[Formula Presented] phase, no relaxation was observed in the linear spectrum, but the third-order nonlinear dielectric spectrum showed a Debye-type relaxation with a relaxation frequency of a few kHz corresponding to the Goldstone mode in the Sm-[Formula Presented] phase. This nonlinear response was theoretically analyzed and ascribed to a field-induced biaxiality, i.e., the deformation of the helical structure due to a coupling between the dielectric anisotropy and the electric field. The temperature dependence of the nonlinear spectrum was also discussed.

Original languageEnglish
Pages (from-to)6080-6084
Number of pages5
JournalPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume53
Issue number6
DOIs
Publication statusPublished - Jan 1 1996
Externally publishedYes

Fingerprint

Dielectric Relaxation
Liquid Crystal
carboxylates
Spectroscopy
liquid crystals
spectroscopy
Dielectric Constant
permittivity
Nonlinear Response
Softening
Linear Order
Tilt
Temperature Dependence
Critical Behavior
softening
Anisotropy
Electric Field
Phase Transition
Fluctuations
temperature dependence

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Mathematical Physics
  • Condensed Matter Physics
  • Physics and Astronomy(all)

Cite this

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title = "Nonlinear dielectric relaxation spectroscopy of the antiferroelectric liquid crystal 4-(1-trifluoromethyl-pheptyloxycarbonyl) phenyl [Formula Presented]-octyloxybiphenyl-4-carboxylate",
abstract = "The linear and third-order nonlinear dielectric constants of the antiferroelectric liquid crystal 4-(1-trifluoromethyl-pheptyloxycarbonyl) phenyl [Formula Presented]-octyloxybiphenyl-4-carboxylate were experimentally studied in its smectic-A (Sm-A) and smectic-[Formula Presented] (Sm-[Formula Presented]) phases. Both dielectric constants showed a critical behavior near the Sm-A–Sm-[Formula Presented] phase transition corresponding to the softening of ferroelectric soft mode and the increase of the fluctuation in the tilt direction. In the Sm-[Formula Presented] phase, no relaxation was observed in the linear spectrum, but the third-order nonlinear dielectric spectrum showed a Debye-type relaxation with a relaxation frequency of a few kHz corresponding to the Goldstone mode in the Sm-[Formula Presented] phase. This nonlinear response was theoretically analyzed and ascribed to a field-induced biaxiality, i.e., the deformation of the helical structure due to a coupling between the dielectric anisotropy and the electric field. The temperature dependence of the nonlinear spectrum was also discussed.",
author = "Yasuyuki Kimura and Reinosuke Hayakawa and Nobuhiro Okabe and Yoshiichi Suzuki",
year = "1996",
month = "1",
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T1 - Nonlinear dielectric relaxation spectroscopy of the antiferroelectric liquid crystal 4-(1-trifluoromethyl-pheptyloxycarbonyl) phenyl [Formula Presented]-octyloxybiphenyl-4-carboxylate

AU - Kimura, Yasuyuki

AU - Hayakawa, Reinosuke

AU - Okabe, Nobuhiro

AU - Suzuki, Yoshiichi

PY - 1996/1/1

Y1 - 1996/1/1

N2 - The linear and third-order nonlinear dielectric constants of the antiferroelectric liquid crystal 4-(1-trifluoromethyl-pheptyloxycarbonyl) phenyl [Formula Presented]-octyloxybiphenyl-4-carboxylate were experimentally studied in its smectic-A (Sm-A) and smectic-[Formula Presented] (Sm-[Formula Presented]) phases. Both dielectric constants showed a critical behavior near the Sm-A–Sm-[Formula Presented] phase transition corresponding to the softening of ferroelectric soft mode and the increase of the fluctuation in the tilt direction. In the Sm-[Formula Presented] phase, no relaxation was observed in the linear spectrum, but the third-order nonlinear dielectric spectrum showed a Debye-type relaxation with a relaxation frequency of a few kHz corresponding to the Goldstone mode in the Sm-[Formula Presented] phase. This nonlinear response was theoretically analyzed and ascribed to a field-induced biaxiality, i.e., the deformation of the helical structure due to a coupling between the dielectric anisotropy and the electric field. The temperature dependence of the nonlinear spectrum was also discussed.

AB - The linear and third-order nonlinear dielectric constants of the antiferroelectric liquid crystal 4-(1-trifluoromethyl-pheptyloxycarbonyl) phenyl [Formula Presented]-octyloxybiphenyl-4-carboxylate were experimentally studied in its smectic-A (Sm-A) and smectic-[Formula Presented] (Sm-[Formula Presented]) phases. Both dielectric constants showed a critical behavior near the Sm-A–Sm-[Formula Presented] phase transition corresponding to the softening of ferroelectric soft mode and the increase of the fluctuation in the tilt direction. In the Sm-[Formula Presented] phase, no relaxation was observed in the linear spectrum, but the third-order nonlinear dielectric spectrum showed a Debye-type relaxation with a relaxation frequency of a few kHz corresponding to the Goldstone mode in the Sm-[Formula Presented] phase. This nonlinear response was theoretically analyzed and ascribed to a field-induced biaxiality, i.e., the deformation of the helical structure due to a coupling between the dielectric anisotropy and the electric field. The temperature dependence of the nonlinear spectrum was also discussed.

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