13C N.M.R. and14N N.Q.R. in ferroelectric liquid crystals Polar versus quadrupolar ordering
作者:
R. Blinc,
J. Dolinšek,
M. Luzar,
J. Seliger,
期刊:
Liquid Crystals
(Taylor Available online 1988)
卷期:
Volume 3,
issue 6-7
页码: 663-675
ISSN:0267-8292
年代: 1988
DOI:10.1080/02678298808086521
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
13C nuclear magnetic resonance and14N nuclear quadrupole resonance spectra of ferroelectric smectic C*liquid crystals and their non-chiral analogues allow for a microscopic determination of the polar and quadrupolar (or bipolar) biasing of rotation around the long molecular axis as well as for a determination of the anisotropy in the fluctuations of this axis. The results show that the microscopic origin of the biquadratic coupling between the polarization and the tilt, which has been recently introduced into the extended Landau model of the SA–S*Ctransition, is the quadrupolar (or bipolar) rotational bias induced by the anisotropy in the fluctuations of the long molecular axis. The tilt induced anisotropy in the fluctuations is practically identical in chiral and non-chiral smectic C phases.
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