抄録
Nonlinear dielectric response of antiferroelectric liquid crystals has been studied in the smectic Cα* (SmCα*) phase. The linear dielectric spectrum shows a single relaxation of Debye type and its relaxation frequency is as high as one hundred kHz. The profile of the third-order nonlinear dielectric spectrum varies in complex fashion with temperature. In the vicinity of the SmA-SmCα* phase transition, experimentally obtained nonlinear spectra are well described by those calculated with phenomenological theory of Landau type. The soft mode of the SmCα* phase shows critical slowing-down near the transition temperature. In the lower-temperature region of the SmCα* phase, the contribution from the soft mode of the SmCα* phase reduces and the other relaxation mode with Debye-type spectrum appears at several hundred Hz in the nonlinear spectrum. The appearance of this low-frequency mode suggests that the cooperative fluctuation of directors over long range exists in the SmCα* phase.
本文言語 | 英語 |
---|---|
ページ(範囲) | 3-13 |
ページ数 | 11 |
ジャーナル | European Physical Journal E |
巻 | 9 |
号 | 1 |
DOI | |
出版ステータス | 出版済み - 9月 2002 |
外部発表 | はい |
!!!All Science Journal Classification (ASJC) codes
- バイオテクノロジー
- 生物理学
- 化学 (全般)
- 材料科学(全般)
- 表面および界面