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 language | English (US) |
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Pages (from-to) | 1322-1325 |
Number of pages | 4 |
Journal | Physical review letters |
Volume | 66 |
Issue number | 10 |
DOIs | |
State | Published - 1991 |