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First observation of aS C * -S A-TGBA multicritical point in a pure compound |
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| Authors: | A Anakkar A Daoudi J -M Buisine N Isaert T Delattre H T Nguyen C Destrade |
| Institution: | 1. Laboratoire de Dynamique et Structure des Matériaux Moléculaires, U.R.A. CNRS no 801, France 2. Equipe de Physique des Stases Anisotropes, Université des Sciences et Technologies de Lille, F59655, Villeneuve d'Ascq, Cedex, France 3. Equipe de Thermophysique de la Matière Condensée, Université du Littoral, Quai Freycinet 1, BP. 5526, F59379, Dunkerque, France 4. Centre de Recherche Paul Pascal Chateau Brivazac, F33600, Pessac, France |
| Abstract: | High pressure experiments have been performed by thermobarometric analysis on two homologous (n=10 and 11) of the 3-fluoro-4((R) or (S)-methylheptyloxy) 4′-(4″-alkoxy-3″-fluorobenzoyloxy) tolans series, which both exhibit the TΓBA phase. The character (first or/and second order) of the transitions involving the TGBA phase are determined from thermobarograms. The pressure-temperature phase diagrams show that the TGBA phase is stabilized under high pressure for the two compounds. Forn=11 an inducedS A phase is observed under high pressures leading to the first experimental observation, on pressure-temperature phase diagram of pure compounds, of aS C * -S A-TGBA multicritical point, previously predicted by the Renn-Lubensky theory. |
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