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Title: Phase diagram exhibiting a smectic-A–smectic-C–smectic-F meeting point
Authors: Raja, V.N.
Shankar Rao, D.S.
Krishna Prasad, S.
Issue Date: 15-Jul-1992
Publisher: The American Physical Society
Citation: Physical Review A, 1992, Vol.46, R726-728
Abstract: We report an observation of a smectic-A–smectic-C–smectic-F (A-C-F) meeting point in a binary liquid-crystalline system. Detailed high-precision x-ray measurements enabled us to characterize the meeting point as a triple point, a point at which the three phases coexist. A direct consequence of this result is the existence of a tricritical point (TCP) on the A-C boundary. Contrary to the known results, the TCP appears despite a large temperature range for the A phase and the occurrence of a nematic phase at a higher temperature. Bearing in mind that F is a tilted hexatic phase, it is suggested that a possible reason for this behavior is the molecular-tilt field arising from the coupling between the tilt and the bond-orientational-order parameters.
ISSN: 1094-1622 (online)
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Copyright: (1992) by the American Physical Society
Appears in Collections:Research Papers (SCM)

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