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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.

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