Nature of the smectic-[Formula Presented]—hexatic-[Formula Presented]—crystal-[Formula Presented] transitions of a liquid-crystal compound

A. J. Jin, M. Veum, T. Stoebe, C. F. Chou, J. T. Ho, S. W. Hui, V. Surendranath, C. C. Huang

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Abstract

High-resolution heat-capacity, optical reflectivity, and electron-diffraction measurements have been conducted on thin free-standing films of a liquid-crystal compound exhibiting the smectic-[Formula Presented]—hexatic-[Formula Presented]—crystal-[Formula Presented] transitions. Despite the absence of herringbone order, the liquid-hexatic transition in extremely thin films has been found to show a pronounced pretransitional heat-capacity anomaly, in disagreement with the predictions of two-dimensional melting theory. In addition, both the surface-enhanced layer-by-layer transition near the smectic-[Formula Presented]—hexatic-[Formula Presented] and an unexpected layer thinning transition above the bulk isotropic-smectic-[Formula Presented] transition temperature have been observed.

Original languageEnglish (US)
Pages (from-to)3639-3646
Number of pages8
JournalPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume53
Issue number4
DOIs
StatePublished - Jan 1 1996

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