Issue |
Europhys. Lett.
Volume 71, Number 6, September 2005
|
|
---|---|---|
Page(s) | 945 - 951 | |
Section | Condensed matter: structural, mechanical and thermal properties | |
DOI | https://doi.org/10.1209/epl/i2005-10180-5 | |
Published online | 12 August 2005 |
Unusual thickness-dependent thermal behavior
due to molecular tilt coupling strength
in free-standing
thin films
Department of Physics, National Taiwan University - Taipei 10617, Taiwan, ROC
Corresponding author: cychao@ntu.edu.tw
Received:
11
April
2005
Accepted:
19
July
2005
We report the results of thermal and structural studies near the
-C–
-I critical point in free-standing thin
films of
. The profiles of the
-C–
-I heat-capacity anomalies are found to
exhibit an unexpected crossover behavior with film thickness in
reduced dimensions, which is qualitatively similar to that seen
in by Yao et al. in the bulk. Moreover, we observe the existence
of a surface hexatic
-L phase in
films of
less than eight layers whose phase sequence is, however,
dramatically different from that observed in thicker films.
PACS: 61.30.Eb – Experimental determinations of smectic, nematic, cholesteric, and other structures / 64.70.Md – Transitions in liquid crystals
© EDP Sciences, 2005
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