Anticlinic-synclinic transitions in superthin free-standing smectic films |
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Authors: | P. V. Dolganov G. Joly P. Cluzeau V. K. Dolganov C. Gors H. T. Nguyen |
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Affiliation: | (1) Institute of Solid State Physics RAS, Chernogolovka, Moscow region, 142432, Russia;(2) Laboratoire de Dynamique et Structures des Matériaux Moleculaire, Université de Lille 1, Villeneuve d’Ascq, 59655, France;(3) Centre de Recherche Paul Pascal, CNRS, Pessac, 33600, France |
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Abstract: | Anticlinic-synclinic transition was studied in superthin smectic films using polarized light reflected microscopy. The measurements were made in a compound exhibiting the mC FI1 * subphase in a narrow temperature interval between antiferroelectric C A * and ferroelectric SmC* phases. In films, we observed series of transitions with numbers increasing with increasing film thickness. Surface ordering leads to increasing transition temperatures with decreasing film thickness and to change of orientation of the molecular tilt plane in layers. Succession of transitions results from competition between the surface and the bulk ordering. We found that line string defects may form in a film, their orientation and collective behavior resulting from elastic deformation of molecular ordering. |
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