Gapless phason in an antiferroelectric liquid crystal

I. Muševič, R. Blinc, B. Žekš, M. Čopič, M. M. Wittebrood, Th. Rasing, H. Orihara, and Y. Ishibashi
Phys. Rev. Lett. 71, 1180 – Published 23 August 1993
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Abstract

The phason dispersion in the antiferroelectric Sm-CA* liquid crystalline phase of 4-(1-methylheptyloxycarbonyl)phenyl 4-octyloxybiphenyl-4-carboxylate has been studied by quasielastic light-scattering experiments. The phason is found to be gapless as predicted for a Goldstone mode recovering the broken continuous symmetry. The dispersion has a minimum at q=2qc, where qc is the wave vector of the unperturbed Sm-CA* structure. These results are consistent with the alternating-tilt model of the antiferroelectric Sm-CA* phase.

  • Received 21 June 1993

DOI:https://doi.org/10.1103/PhysRevLett.71.1180

©1993 American Physical Society

Authors & Affiliations

I. Muševič, R. Blinc, B. Žekš, and M. Čopič

  • J. Stefan Institute, Jamova 39, 61000 Ljubljana, Slovenia

M. M. Wittebrood and Th. Rasing

  • Research Institute for Materials and High Field Magnet Laboratory, University of Nijmegen, Toernooiveld, 6525 ED Nijmegen, The Netherlands

H. Orihara and Y. Ishibashi

  • Synthetic Crystal Research Laboratory, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-01, Japan

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Vol. 71, Iss. 8 — 23 August 1993

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