Magnetic and Dielectric Properties of HoFe2O4 and R1-xR$'_{x}$Fe2O4 (R, R$'$: Rare Earths)

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概要

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• Rare-earth iron oxides of the form RFe2O4 (R = Y, Ho–Lu) show a new mechanism of ferroelectricity owing to the charge ordering of Fe ions below ${\sim}330$ K. To determine the physical properties of this system, the magnetic and dielectric properties of HoFe2O4 and R1-xR$'_{x}$Fe2O4 were investigated (R, R$'$: rare earths). All the materials showed dielectric constants of ${\sim}1000--10000$, as reported for some other RFe2O4 oxides. For HoFe2O4, magnetic ordering occurred at a temperature lower than those of RFe2O4 reported thus far. On the other hand, the dielectric measurements of this material suggested the development of a correlation between polar regions at higher temperatures, which was also observed for the Sc-substituted system Lu1-xScxFe2O4. These results encourage detailed investigations of these materials from the viewpoints of both fundamental and applied sciences, and suggest the existence of other new properties of RFe2O4.

• 2008-09-25

著者

• Yoshii Kenji

  Japan Atomic Energy Research Institute

• Matsuo Yoji

  Osaka Prefecture University, Sakai 599-8531, Japan

• Mori Shigeo

  Osaka Prefecture University, Sakai 599-8531, Japan

• Yoneda Yasuhiro

  Japan Atomic Energy Agency, Sayo, Hyogo 679-5148, Japan

• Maeda Daisuke

  Okayama University, Okayama 700-8530, Japan

• Yokota Yusuke

  Okayama University, Okayama 700-8530, Japan

• Michiuchi Takamasa

  Okayama University, Okayama 700-8530, Japan

• Komatsu Takuma

  Okayama University, Okayama 700-8530, Japan

• Ikeda Naoshi

  Okayama University, Okayama 700-8530, Japan

• Yoshii Kenji

  Japan Atomic Energy Agency (JAEA), Sayo, Hyogo 679-5148, Japan

• Yoneda Yasuhiro

  Japan Atomic Energy Agency (JAEA), Sayo, Hyogo 679-5148, Japan

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