| Autor: |
S. Krishna Prasad, M. E. Neubert, Gerd Heppke, S. Chandrasekhar, V. N. Raja, D. S. Shankar Rao |
| Rok vydání: |
1994 |
| Předmět: |
|
| Zdroj: |
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals. 238:241-247 |
| ISSN: |
1058-725X |
| Popis: |
The smectic A-smectic C (A-C) transition in several compounds has been shown to be mean-field-like (MF) with a substantial tricritical crossover effect. However, a simple MF behaviour, i.e., with negligible tricritical influence, had not been reported till recently. The heat capacity measurements of the MIT group in two compounds exhibiting the bilayer A2−C2 transition revealed such a behaviour. It is of interest to investigate whether a simple MF behaviour can be observed for partially bilayer Ad−Cd and monolayer A1−C1 transitions also. We report the first systematic order parameter measurements in the vicinity of the A2−C2, Ad−Cd and A1−C1 transitions. The data analysed in terms of power law and extended mean field expressions provide clear evidence of a simple MF behaviour in all three cases. The significance of this result is discussed. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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