Dipole glass behavior of RFe₂O₄

N. Ikeda Department of Physics, Waseda University, Shinjuku-ku, Tokyo, 169, Japan

K. Odaka Department of Physics, Waseda University, Shinjuku-ku, Tokyo, 169, Japan

E. Takahashi Department of Physics, Waseda University, Shinjuku-ku, Tokyo, 169, Japan

K. Kohn Department of Physics, Waseda University, Shinjuku-ku, Tokyo, 169, Japan

K. Siratori Department of Physics, Kyushu University, Higashi-ku, Fukuoka, 813, Japan

Abstract

We report low frequency dielectric dispersions of ErFe₂O₄ in which equal numbers of Fe²⁺ and Fe³⁺ ions occupy the sites on a triangular lattice. The first dispersion observed between 200 K and 300 K is explained qualitatively on a model that spontaneous polarization is present in the crystal below the Verwey transition. The second dispersion at higher temperatures is characterized by a few glass-like features. It was interpreted by successive freezing of the local dipole moments accompanied by short-range ordering of Fe²⁺ and Fe³⁺ ions.

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Dipole glass behavior of RFe₂O₄