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Anomalous Temperature Dependence of the Elastic Constant B at the Smectic-to-Nematic Phase Transition in Binary Mixtures of Hexyloxycyanobiphenyl-Octyloxycyanobiphenyl (60CB-80CB)

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1982

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American Physical Society
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Fisch, M. R., L. B. Sorensen, and Peter S. Pershan. 1982. Anomalous temperature dependence of the elastic constant B at the smectic-to-nematic phase transition in binary mixtures of hexyloxycyanobiphenyl-octyloxycyanobiphenyl (60CB-80CB). Physical Review Letters 48(14): 943–946.

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In hexyloxycyanobiphenyl-octyloxycyanobiphenyl (60CB-80CB) binary mixtures displaying reentrant behavior, the smectic elastic constant, B, deviates from a simple power law of the form \(B=B_1(T_{NA}-T)^{\varphi}\) and levels off as \(T \rightarrow T_{NA}\). This behavior is consistent with the Nelson-Toner dislocation-unbinding model of the transition.

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