Frequency variation of periodic distortion thresholds in a nematic liquid crystal
作者:
SHILA GARG,
STEVEN WILD,
BEN ZURN SALMAN SAEED,
U. D. KINI,
期刊:
Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 24,
issue 4
页码: 501-517
ISSN:0267-8292
年代: 1998
DOI:10.1080/026782998206957
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Investigations are reported on the electric field induced orientational transitions in the bend Freedericksz geometry under the action of a stabilizing magnetic field. When the magnetic field is strong enough, the deformation above electric threshold is periodic with the periodicity disappearing at a higher voltage. The alignment does not remain homeotropic below threshold and the sample exhibits pretransitional biaxiality. Every transition is discontinuous and accompanied by hysteresis. The expected form of scaling appears to hold for all the observed thresholds. The thresholds and the direction of the wave vector are frequency dependent, showing that the instability mechanism involves electrical conductivity.
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