Characterization several novel phase transitions in a unique lower dimension system of free-standing liquid-crystal films

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

Research output: Contribution to journalReview articlepeer-review

4 Scopus citations

Abstract

Motivated by the defect-mediated two-stage melting theory, extensive experiments have been concluded on free-standing films of a liquid-crystal sample which exhibits the isotropic-smectic-A-hexatic B-crystal-B bulk phase sequence. For a two-layer film, which is virtually two-dimensional, our calorimetric measurement shows an apparently divergent anomaly near the smectic-A-hexatic-B transition. Its anomaly has a dominant fluctuation contribution and can be fitted to a power law with an exponent α ≈ 0.37 ± 0.05, in disagreement with the theoretical prediction. Thicker films exhibit surface-initiated layer-by-layer (LBL) wetting transition upon cooling. Moreover, these films also exhibit interesting LBL thinning transitions above the bulk clearing temperature.

Original languageEnglish (US)
Pages (from-to)269-277
Number of pages9
JournalModern Physics Letters B
Volume10
Issue number7
DOIs
StatePublished - Mar 20 1996

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