Modeling and Control Principle for Ferroelectric–Antiferroelectric Phase Transition

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Other Title
  • 強誘電–反強誘電相転移のモデル化と制御原理
  • キョウ ユウデン-ハン キョウ ユウデンソウ テンイ ノ モデルカ ト セイギョ ゲンリ

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Abstract

<p>Ferroelectricity and antiferroelectricity are of great importance not only in condensed matter physics but also in technological applications due to their electrical controllability and cross-coupling effects such as electromechanical and electrocaloric responses. We here develop a simple model system composed of spheroid-like particles with a permanent dipole, which may capture an essence of phase transitions between ferroelectric and antiferroelectric phases. With this model, we reveal that energetic frustration between the dipole-dipole interaction and interparticle steric interaction is a key to control ferroelectric–antiferroelectric phase transition accompanied by electromechanical coupling. We also show that the inverse electrocaloric effect can be induced as a consequence of the entropy difference between the ferroelectric and antiferroelectric phases. Thus, we reveal a simple physical principle behind the coupling between polarization ordering and structural phase transition responsible for large electromechanical effects. It may apply to organic and macromolecular systems.</p>

Journal

  • Butsuri

    Butsuri 76 (3), 156-161, 2021-03-05

    The Physical Society of Japan

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