Helically modulated electroclinical effects in twist grain boundary liquid crystals |
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| Authors: | M Petit M Nobili P Barois |
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| Institution: | (1) Centre de Recherche Paul Pascal - CNRS, avenue A. Schweitzer, 33600 Pessac, France, FR;(2) Institut Non-Linéaire de Nice, Sophia-Antipolis, 1361 route des Lucioles, 06560 Valbonne, France, FR |
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| Abstract: | We report the first observation of an electroclinical effect at the TGB-TGB transition induced by an external DC electric field applied perpendicular to the pitch direction. Upon increasing the field,
the smectic layers rather than the director field tilt over relative to the helical axis, allowing to detect the effect by
X-ray scattering from well aligned samples. The observations are qualitatively interpreted in the frame of a mean field phenomenological
model of a helically modulated electroclinical effect.
Received: 24 April 1998 / Revised: 22 June 1998 / Accepted: 31 July 1998 |
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| Keywords: | PACS 61 30 Gd Orientational order of liquid crystals electric and magnetic field effects on order - 64 70 Md Transitions in liquid crystals |
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