Dielectric Relaxation Behavior of Ferroelectric Smectic-A Phase in Dimeric Molecules

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  • Nakasugi Shigemasa
    Advanced Technology Research Dep., LG Japan Lab Inc.
  • Kang Sungmin
    Advanced Technology Research Dep., LG Japan Lab Inc. Institute of Innovative Research, Tokyo Institute of Technology
  • Watanabe Junji
    Institute of Innovative Research, Tokyo Institute of Technology
  • Sone Masato
    Institute of Innovative Research, Tokyo Institute of Technology
  • Ishizaki Hiroki
    Advanced Technology Research Dep., LG Japan Lab Inc. Institute of Innovative Research, Tokyo Institute of Technology

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  • 二量体分子における強誘電性スメクチック-A相の誘電緩和挙動
  • ニリョウタイ ブンシ ニ オケル キョウ ユウデンセイ スメクチック-Aソウ ノ ユウデン カンワ キョドウ

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Abstract

<p>The dielectric relaxation behavior is investigated in the ferroelectric smectic-A phase, which is a mixture of schiff base dimeric molecules with different alkyl chain lengths. The ferroelectric smectic-A phase shows the Goldstone mode due to its high dielectric strength (relative permittivity excluding the contribution of ion diffusion in the low frequency region). The dielectric strength increases dramatically with increasing the cell thickness. By applying the DC bias fields, the Goldstone mode of the ferroelectric smectic-A phase is quenched, and this phenomenon is explained by the suppression of the dipoles' fluctuation due to the DC bias fields. The Goldstone mode and the high frequency mode of the SmAPF phase follow the standard Arrhenius equation in the vicinity of the phase transition with the isotropic phase.</p>

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