Kinked Focal Conic Domains in a SmA
| Autor: | Yuriy Nastishin, Claire Meyer, Maurice Kleman |
|---|---|
| Přispěvatelé: | Physique des Systèmes Complexes - UR UPJV 4663 (PSC), Université de Picardie Jules Verne (UPJV), Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2007 |
| Předmět: |
Materials science
02 engineering and technology kinks Ellipse 01 natural sciences achiral smectic A Optics Liquid crystal Phase (matter) 0103 physical sciences General Materials Science Ideal (ring theory) defects 010302 applied physics Condensed matter physics business.industry Isotropy General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics SMA Hyperbola Conic section [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other] focal conic domains 0210 nano-technology business |
| Zdroj: | Mol. Cryst. Liq. Mol. Cryst. Liq., 2007, 477, pp.537-547. ⟨10.1080/15421400701732449⟩ |
| ISSN: | 1542-1406 |
| DOI: | 10.1080/15421400701732449 |
| Popis: | International audience; We have investigated Focal Conic Domains (FCD) in several materials that have a transition from a SmA to a nematic phase (N): the focal lines are seldom an ideal ellipse and an ideal hyperbola, and suffer large transformations (in shape and in size) when approaching the transition to the nematic phase, or appear imperfect on cooling from the nematic phase. Some examples of these transformations are shown, including the temperature dependence of the ellipse diameter. Contrari- wise, FCDs remain unchanged on heating up to or cooling down from the transition to the isotropic phase in materials that have a direct transition to the isotropic phase. We interpret the imperfections of the FCDs observed in nematogenic materials as due to the interactions of FCDs with dislocations. Such interactions are mediated through the presence of kinks on the focal lines of the FCDs, to which the dislocations are attached. |
| Databáze: | OpenAIRE |
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