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Splay Nematic Phase

Physical review. X, 2018-11, Vol.8 (4), p.041025, Article 041025 [Peer Reviewed Journal]

2018. This work is licensed under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;ISSN: 2160-3308 ;EISSN: 2160-3308 ;DOI: 10.1103/PhysRevX.8.041025

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  • Title:
    Splay Nematic Phase
  • Author: Mertelj, Alenka ; Cmok, Luka ; Sebastián, Nerea ; Mandle, Richard J. ; Parker, Rachel R. ; Whitwood, Adrian C. ; Goodby, John W. ; Čopič, Martin
  • Subjects: Antiferroelectricity ; Crystal structure ; Crystallinity ; Deformation ; Electrical properties ; Liquid crystals ; Molecular structure ; Nematic crystals ; Phase transitions ; Phases ; Photon correlation spectroscopy ; Symmetry ; X ray scattering
  • Is Part Of: Physical review. X, 2018-11, Vol.8 (4), p.041025, Article 041025
  • Description: Different liquid crystalline phases with long-range orientational but not positional order, so-called nematic phases, are scarce. New nematic phases are rarely discovered, and such an event inevitably generates much interest. Here, we describe a transition from a uniaxial to a novel nematic phase characterized by a periodic splay modulation of the director. In this new nematic phase, defect structures not present in the uniaxial nematic phase are observed, which indicates that the new phase has lower symmetry than the ordinary nematic phase. The phase transition is weakly first order, with a significant pretransitional behavior, which manifests as strong splay fluctuations. When approaching the phase transition, the splay nematic constant is unusually low and goes towards zero. Analogously to the transition from the uniaxial nematic to the twist-bend nematic phase, this transition is driven by instability towards splay orientational deformation, resulting in a periodically splayed structure. And, similarly, a Landau-de Gennes type of phenomenological theory can be used to describe the phase transition. The modulated splay phase is biaxial and antiferroelectric.
  • Publisher: College Park: American Physical Society
  • Language: English
  • Identifier: ISSN: 2160-3308
    EISSN: 2160-3308
    DOI: 10.1103/PhysRevX.8.041025
  • Source: ROAD: Directory of Open Access Scholarly Resources
    ProQuest Central
    DOAJ Directory of Open Access Journals
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