Light scattering studies of crossover to a liquid crystal tricritical point |
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Authors: | L Solomon J D Litster |
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Institution: | (1) Department of Physics and Center for Materials Science and Engineering, Massachusetts Institute of Technology, 02139 Cambridge, Mass., USA;(2) Present address: Brookhaven National Laboratory, 11973 Upton, NY, USA |
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Abstract: | We have used light scattering to study nematic elastic constantsK
2 andK
3 in the alkyl-cyanobiphenyl (n CB) system. As the average alkyl chain lengthn increases, the temperature range of the nematic phase decreases and the system approaches a tricritical point. Our data are analyzed to determine the parallel and perpendicular correlation lengths and critical exponents for smectic short-range order. We find a continuous decrease in the critical exponentsv
andv
as the tricritical point, which occurs at 9.1 CB, is approached. There is also a significant decrease in the magnitude of the parallel correlation length at a fixed reduced temperature. |
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Keywords: | |
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