Superlattice structures observed in the extraordinary phase sequence and analyzed by the phenomenological Landau model and the partially molecular model.
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2013Access:
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Sandhya KL, Chandani AD, Fukuda A, Kumar S, Vij JK, Superlattice structures observed in the extraordinary phase sequence and analyzed by the phenomenological Landau model and the partially molecular model., Physical review. E, Statistical, nonlinear, and soft matter physics, 87, 6-1, 2013, 062506Download Item:
PhysRevE.87.062506.pdf (Published (publisher's copy)) 3.743Mb
Abstract:
We draw several electric-field-temperature (E-T) phase diagrams with electric-field-induced birefringence contours in the nOHFBBB1M7 (n=10) and nOTBBB1M7 (n=11) (C11) mixture system by changing the C11 concentration carefully; some of the mixtures show the unusual extraordinary phase sequence where subphases with the four-, five-, and six-layer superlattice structures emerge above the smectic-C* main phase. We try to understand the results in terms of two complementary models that have so far been proposed: the phenomenological Landau model of phase transitions by Dolganov and the partially molecular Emelyanenko-Osipov model. The observed E-T phase diagram can be well reproduced by the phenomenological model. An emergence of the subphase with the four-layer superlattice structure above smectic-C* is also understandable in terms of the partially molecular model. We discuss the pros and cons of the two models as well
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Grant Number
Science Foundation Ireland (SFI)
11/W.1/195
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http://people.tcd.ie/jvijhttp://people.tcd.ie/atsuof
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Author: FUKUDA, ATSUO; VIJ, JAGDISH
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Physical review. E, Statistical, nonlinear, and soft matter physics87
6-1
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http://dx.doi.org/10.1103/PhysRevE.87.062506Licences: