Hexatic and crystal phase transitions in thin free-standing liquid-crystal films

R. Geer, T. Stoebe, C. C. Huang, R. Pindak, G. Srajer, J. W. Goodby, M. Cheng, J. T. Ho, S. W. Hui

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

Thermal and structural studies have been performed on thin films of n-heptyl-4'-n-pentyloxylbiphenyl-4-carboxylate (75OBC). Similar to 65OBC, a surface hexatic phase is observed for films greater than four molecular layers in thickness. Four- and three-layer films display a single, two-dimensional liquid-hexatic transition. The four-layer heat-capacity anomaly is described well by a divergent power-law expression. The three-layer heat-capacity anomaly is qualitatively the same, although its size is greatly reduced. Also, a surface crystal-E phase is observed immediately below the liquid-hexatic transition(s).

Original languageEnglish (US)
Pages (from-to)1322-1325
Number of pages4
JournalPhysical review letters
Volume66
Issue number10
DOIs
StatePublished - Jan 1 1991

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