Specific Heat Due to Smectic-C to Smectic-l Bond Orientational Ordering
- 1 May 1989
- journal article
- research article
- Published by Taylor & Francis in Molecular Crystals and Liquid Crystals
- Vol. 170 (1) , 71-78
- https://doi.org/10.1080/00268948908047748
Abstract
A high-resolution calorimetric study of methylbutylphenyloctyloxybiphenyl carboxylate (8OSI) has been carried out near the smectic-C to hexatic smectic-I transition. The excess heat capacity peak ΔCl , is large but clearly rounded over a 300 mK range. The ΔCp data and previously published Co order parameter data can be fit simultaneously using a phenomenological equation of state with a temperature independent tilt field H. Interpretation of the underlying effective critical exponents α = 0.47 and β = 0.077 is not clear, but one possibility is that the SmC‒SmI transition in the limit H → 0 would be weakly first-order.Keywords
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