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- W2044992605 abstract "A phenomenological model for frustrated smectics with competition for order at incommensurate wavevectors k 1 and k 2 is used to study phase diagrams and x-ray scattering intensity within mean field theory. It is shown that in addition to the nematic (N) and monolayer (SA1) phases, the phase diagram may involve two distinct bilayer (SA2) phases separated by a first order linne terminating in a critical point. One of the SA2 phases exhibits very little harmonic modulation and can be identified with the experimentally characterized partial bilayer SAd phase. In addition for larger incommensurability, an unusual bicritical point where N, SA1 and SA2 phases meet is identified Nous etudions un modele phenomenologique de Landau de systemes frustres dans lequel sont en competition deux vecteurs d'onde de modulation k 1 et k 2 incommensurables. Outre les phases nematique et smectique monocouche (SA1), les diagrammes de phase calcules montrent l'existence de deux phases bicouches distinctes (SA2) separees par une ligne de transition du premier ordre se terminant en un point critique. Les intensites de diffusion des rayons X sont egalement calculees: elles conduisent a identifier l'une des phases SA2, presentant une tres faible modulation harmonique au vecteur d'onde (0, 0, 2q 0 ), a la phase partiellement bicouche SAd connue experimentalement. Un nouveau point bicritique N-SA1-SA2 est mis en evidence en cas de forte incommensurabilite" @default.
- W2044992605 created "2016-06-24" @default.
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- W2044992605 date "1985-01-01" @default.
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- W2044992605 title "New critical points in frustrated smectics" @default.
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- W2044992605 doi "https://doi.org/10.1051/jphys:01985004603039100" @default.
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