Charge Frustration and Dielectric Dispersion in LuFe<sub>2</sub>O<sub>4</sub>

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  • Ikeda Naoshi
    Advanced Research Center, Waseda University, Okubo–3, Shinjuku–ku, Tokyo 169–8555
  • Kohn Kay
    Department of Physics, Waseda University, Okubo–3, Shinjuku–ku, Tokyo 169–8555
  • Myouga Nobuyuki
    Department of Physics, Waseda University, Okubo–3, Shinjuku–ku, Tokyo 169–8555
  • Takahashi Eri
    Department of Physics, Waseda University, Okubo–3, Shinjuku–ku, Tokyo 169–8555
  • Kitôh Hijiri
    National Institute for the Research of Inorganic Materials, 1–1 Namiki Tsukuba, Ibaraki 305–0044
  • Takekawa Shunji
    National Institute for the Research of Inorganic Materials, 1–1 Namiki Tsukuba, Ibaraki 305–0044

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  • Charge Frustration and Dielectric Dispersion in LuFe2O4.

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We report the dielectric anomaries at the phase transitions of Lu(Fe2+ Fe3+)O4, which is considered as a charge and spin frustrated system. Dielectric constant shows a hump, just above the transition from the high temperature two-dimensional to the low temperature three-dimensional charge ordering. A few glassy behaviors were observed at this transition. The presence of spontaneous polarization in the low temperature phase was confirmed by the measurement of pyroelectricity. A step-wise increase of the dielectric constant with increasing temperature was observed between 150 K and 250 K as in other RFe2O4. These phenomena are explained by the presence of the polar domains with the ordering of Fe2+ and Fe3+ and the motions of the antiphase boundaries between them.

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