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Behavior of the layer compression modulus as a function of frequency near the nematic-smectic-A and re-entrant nematic-smectic-A phase transitions

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Abstract.

A progressive cross-over of the layer compression modulus B from a simple power law behavior to a saturation behavior when the frequency is increased from 1 Hz to \(2 \cdot 10^{3}\) Hz is observed for the first time near the nematic-smectic-A and the re-entrant nematic-smectic-A phase transitions of a mixture of 4-cyano-4’-(n-hexyloxy)biphenyl and 4-cyano-4’-(n-octyloxy)biphenyl (6OCB-8OCB). This result shows that the saturation of B determined by second sound near the nematic-smectic-A phase transition of a similar mixture is dynamic in nature, and cannot be associated with the static saturation effect predicted by the dislocation loop model, as proposed previously.

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Correspondence to P. Martinoty.

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PACS:

64.70.Md Transitions in liquid crystals - 64.60.Ht Dynamic critical phenomena - 62.20.Dc Elasticity, elastic constants

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Rogez, D., Collin, D. & Martinoty, P. Behavior of the layer compression modulus as a function of frequency near the nematic-smectic-A and re-entrant nematic-smectic-A phase transitions. Eur. Phys. J. E 14, 43–47 (2004). https://doi.org/10.1140/epje/i2004-10004-6

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