Extension of the Hamaneh - Taylor model using the macroscopic polarization for the description of chiral smectic liquid crystals
| Autor: | S. Essid, A. Gharbi, H. Dhaouadi, J. P. Marcerou, N. Bitri, T. Soltani |
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| Přispěvatelé: | Laboratoire de Physique de la Matière Molle (LPMM), Faculté des Sciences Mathématiques, Physiques et Naturelles de Tunis (FST), Université de Tunis El Manar (UTM)-Université de Tunis El Manar (UTM), Centre de recherches Paul Pascal (CRPP), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Cristaux Liquides Smectiques chiraux, Laboratoire de Physique de la Matière Molle de Tunis, Laboratoire de Physique de la Matière Molle, Tunis |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Molecular and microscopic models
FOS: Physical sciences 02 engineering and technology Condensed Matter - Soft Condensed Matter 01 natural sciences therories of liquid crystal structure Condensed Matter::Materials Science Liquid crystal Electric field 0103 physical sciences Phenomenological model Antiferroelectricity Twist 010306 general physics Phase diagram Physics Condensed Matter::Quantum Gases Condensed matter physics 021001 nanoscience & nanotechnology Polarization (waves) Ferroelectricity Ferroélectrique pacs: 61.30.Cz Condensed Matter::Soft Condensed Matter Chiral Smectique 61.30.Cz Soft Condensed Matter (cond-mat.soft) [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] 0210 nano-technology [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft] |
| Zdroj: | Physical Review E : Statistical, Nonlinear, and Soft Matter Physics Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, American Physical Society, 2009, 80 (3), pp.031712. ⟨10.1103/PhysRevE.80.031712⟩ Physical Review E Physical Review E, American Physical Society (APS), 2009, 80 (031712), pp. 1-7. ⟨10.1103/PhysRevE.80.031712⟩ |
| ISSN: | 1539-3755 1550-2376 2470-0045 2470-0053 |
| DOI: | 10.1103/PhysRevE.80.031712⟩ |
| Popis: | Chiral smectic liquid crystals exhibit a series of phases, including ferroelectric, antiferroelectric, and ferrielectric commensurate structures as well as an incommensurate $\text{Sm-}{C}_{\ensuremath{\alpha}}^{\ensuremath{\ast}}$ phase. We carried out an extension of the phenomenological model recently presented by Hamaneh and Taylor based on the distorted-clock model. The salient feature of this model is that it links the appearance of phases to a spontaneous microscopic twist: i.e., an increment $\ensuremath{\alpha}$ of the azimuthal angle from layer to layer. The balance between this twist and an orientational order parameter $J$ gives the effective phase. We introduce a second orientational order parameter $I$, which physical meaning comes from the macroscopic polarization; the effect of an applied electric is also studied. We derive phase diagrams and correlate them to our experimental results under field showing the sequence of phases versus temperature and electric field in some compounds. |
| Databáze: | OpenAIRE |
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