Local Structure Modulation in the Electronic Ferroelectric Oxide LuFe₂O₄

• Hayakawa Hironori

  Okayama University

• Morimoto Masanori

  Okayama University

• Ikeda Naoshi

  Okayama University

• Yoneda Yasuhiro

  Japan Atomic Energy Agency

• Kohara Shinji

  Japan Synchrotron Radiation Research Institute

• Yoshii Kenji

  Japan Atomic Energy Agency

• Matsuo Yoji

  Osaka Prefecture Univesity

• Michiuchi Takamasa

  Okayama University

• Mori Shigeo

  Osaka Prefecture Univesity

抄録

We have investigated the physical properties and local atomic structure of LuFe₂O₄, a material belonging to the multiferroic system RFe₂O₄ (R: rare earths) which shows the new type of ferroelectricity owing to the charge ordering of Fe ions. Magnetic measurements showed the ferromagnetic ordering of Fe spins at ～230 K, as reported previously. From dielectric measurements, the dielectric constant (ε') of ～10000 was obtained at around room temperature. In addition, a peak of ε' was observed near the charge-ordering temperature (～330 K). The peak temperature was insensitive to the frequency of AC electric field; this behavior is different from that found in a previous study. The pair-distribution function analysis on a high-energy X-ray diffraction pattern revealed that LuFe₂O₄ has the systematic modulation of the local atomic displacement.

収録刊行物

• Transactions of the Materials Research Society of Japan

  Transactions of the Materials Research Society of Japan 34 (1), 51-54, 2009

  一般社団法人 日本MRS

キーワード

• RFe₂O₄
• dielectric dispersion
• charge ordering
• local structure
• pair distribution function

詳細情報

• CRID: 1390282680490114304
• NII論文ID: 130005003920
• DOI: 10.14723/tmrsj.34.51
• COI: 1:CAS:528:DC%2BD1MXmsFWgu7s%3D
• ISSN: 21881650
• ISSN: 13823469
• 本文言語コード: ja
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