Current Researches of Relaxors -Steps from Quantum Paraelectrics to Relaxors-

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  • Yokota Hiroko
    Department of Physics, Faculty of Advanced Science and Engineering, Waseda University
  • Uesu Yoshiaki
    Department of Physics, Faculty of Advanced Science and Engineering, Waseda University

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Other Title
  • リラクサー研究の最近の動向―量子常誘電体からリラクサーへの道―
  • サイエンス記事 リラクサー研究の最近の動向--量子常誘電体からリラクサーへの道
  • サイエンス キジ リラクサー ケンキュウ ノ サイキン ノ ドウコウ リョウシ ジョウ ユウデンタイ カラ リラクサー エ ノ ミチ

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<p>Current topics of relaxor studies are summarized with focusing on the quantum relaxor KTaO3 doped with Li, which bears all the characteristics of the prototype relaxor; (1) dielectric response described by the Vogel-Fulcher law, (2) history dependence of the order parameter, (3) slow development of the order parameter after an extremely long incubation time, and (4) nucleation and growth of the polar nano-region in non-polar matrix. In addition, the tri-critical point that separates the first and second order phase transitions is located in the vicinity of the line of critical end points, which enhances the dielectric response of the system. This kind of critical behavior is originated from the complex competition between a long-range Coulomb interaction, a short-range dipolar interaction, a quantum fluctuation (zero-point vibration) and a random field. This phenomenon is promising for the future trend of functional material quests.</p>

Journal

  • hamon

    hamon 19 (2), 95-100, 2009

    The Japanese Society for Neutron Science

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