Charge Frustration and Dielectric Dispersion in LuFe_2O_4 : Condensed Matter: Electronic Properties, etc.
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概要
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We report the dielectric anomaries at the phase transitions of Lu(Fe^<2+> Fe^<3+>)O_4, 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 250K as in other RFe_2O_4. These phenomena are explained by the presence of the polar domains with the ordering of Fe^<2+> and Fe^<3+> and the motions of the antiphase boundaries between them.
- 2000-05-15
著者
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KOHN Kay
Department of Physics, Waseda University
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Takekawa Shunji
National Institute for Research in Inorganic Materials
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Kohn Kay
Department Of Applied Physics School Of Science And Engineering Waseda University
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Ikeda Naoshi
Advanced Research Center Waseda University:(present)japan Synchrotron Radiation Research Institute
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Takekawa Shunji
National Institute For Research In Inorganec Materials
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TAKAHASHI Eri
Department of Obstetrics and Gynecology, Jikei University Aoto Hospital
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Takahashi Eri
Department Of Applied Chemistry Utsunomiya University
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Takekawa Shunji
National Institute For The Research Of Inorganic Materials
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MYOUGA Nobuyuki
Department of Physics, Waseda University
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KITOH Hijiri
National Institute for the Research of Inorganic Materials
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Kitoh Hijiri
National Institute For The Research Of Inorganic Materials:(present)electrotechnical Laboratory
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Myouga Nobuyuki
Department Of Physics Waseda University
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Takahashi Eri
Department Of Physics Waseda University
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Ikeda Naoshi
Advanced Research Center for Science and Engineering,Waseda University
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Takekawa Shunji
National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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