Nonlinear Dielectric Spectroscopy of the Goldstone Mode in an Antiferroelectric Liquid Crystal.
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概要
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The third-order nonlinear dielectric constant of an antiferroelectric liquid crystal, MHPOBC, was measured in the antiferroelectric phase (SmC<SUP>*</SUP><SUB>A</SUB>). The third-order dielectric relaxation due to the antiferroelectric Goldstone mode was observed, which was Debye-type. This Debye-type relaxation in the third-order dielectric response indicates that the third-order dielectric constant should be proportional to the linear susceptibility of the antiferroelectric Goldstone mode. The temperature dependence of the relaxation frequency was obtained from the third-order dielectric constant. By comparing it with that obtained by the photon correlation spectroscopy, it was found that the surface anchoring has a great influence on the helical pitch.
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