Ferroelectricity from electron ordering

Ikeda, Naoshi*; Mori, Shigeo*; Yoshii, Kenji ; Matsuo, Yoji*

We report ferroelectricity in the triangular mixed valence material RFe $_{2}$ O $_{4}$ (R=Y, Dy, Ho, Er, Tm, Yb, Lu). This ferroelectricity originates from the polar ordering of Fe $^{3+}$ and Fe $^{2+}$ or the polar ordering of electrons on Fe $^{3+}$ . The electric polarization arising from such electron ordering may not couple with the lattice modulation. The ordering process of Fe $^{3+}$ and Fe $^{2+}$ is explained by the frustrated interaction of charges in a triangular lattice. The ferroelectric property of this material is present at room temperature.

Language	:	English
Journal	:	Materials Research Society Symposium Proceedings, Vol.966 (Internet)
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Pages	:	9 Pages
Publication Year/Month	:	2007/03
Meeting title	:	Materials Research Society 2006 Fall Meeting
Held date	:	2006/11
Location (city)	:	Boston
Location (country)	:	U.S.A.
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Keywords	:	no keyword
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Registration No. : BB20071112
JAEA Abstracts No. : 35001236
Paper Submission No. : 2828

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