Evidence for de Vries structure in a smectic-A liquid crystal observed by polarized Raman scattering

Naoki Hayashi, Tatsuhisa Kato, Atsuo Fukuda, Jagdish K. Vij, Yuri P. Panarin, J. Naciri, R. Shashidhar, Sachiko Kawada, and Shinya Kondoh
Phys. Rev. E 71, 041705 – Published 25 April 2005

Abstract

The second- and fourth-order apparent orientational order parameters of the core part of the molecule P2app and P4app, have been measured by polarized vibrational Raman spectroscopy for a homogeneously aligned ferroelectric smectic liquid crystal with three dimethyl siloxane groups in the achiral terminal chain, which shows de Vries–type phenomena, i.e., very large electroclinic effect in the smectic-A (SmA) phase and a negligible layer contraction at the phase transition between the SmA and SmC* phases. The apparent orientational order parameters of the rigid core part of the molecule are extremely small both with and without the external electric field in SmA. These results provide evidence for the existence of the de Vries SmA phase, where the local molecular director is tilted at a large angle.

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  • Received 3 September 2003

DOI:https://doi.org/10.1103/PhysRevE.71.041705

©2005 American Physical Society

Authors & Affiliations

Naoki Hayashi* and Tatsuhisa Kato

  • Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan

Atsuo Fukuda, Jagdish K. Vij, and Yuri P. Panarin

  • Department of Electronic and Electrical Engineering, Trinity College, University of Dublin, Dublin 2, Ireland

J. Naciri and R. Shashidhar

  • Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Code 6900, 4555 Overlook Avenue South West, Washington, DC 20375, USA

Sachiko Kawada and Shinya Kondoh

  • Citizen Watch Co., Ltd., Tokorozawa 359-8511, Japan

  • *Present address: Advanced Core Laboratory, Fuji Photo Film Co., 210 Nakanuma, Minami-Ashigara, Kanagawa 250–0193,Japan. Electronic address: naoki_a_hayashi@fujifilm.co.jp
  • Electronic address: jvij@tcd.ie

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Issue

Vol. 71, Iss. 4 — April 2005

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