期刊
PHYSICAL REVIEW LETTERS
卷 86, 期 7, 页码 1267-1270出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.1267
关键词
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The orientational order parameter decrease, due to nematic director macroscopic fluctuations, is obtained by birefringence measurements around the nematic <----> smectic-A transition temperature of the liquid crystal 4'-n-octyl-4-cyanobiphenyl. The measured nematic order reduction shows the same amplitude as the secondary order parameter discontinuity at the transition providing direct evidence of the Halperin-Lubensky-Ma effect. The importance of nematic director thermal fluctuations on the character of the transition is revealed as their quenching by an electric field of similar to 20 V/mum restores the second order character of the transition.
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