Anisotropy of Dielectric Dispersion in ErFe_2O_4 Single Crystal

概要

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Dielectric dispersion was observed in a single crystal with the composition of ErFe_2O_<3.95> below magnetic transition temperature. It is characterized by a large dielectric constant of the order of 10^4, and a Debye-type frequency dependence like in the polycrystalline samples of the same substance which we reported in a previous paper. Large anisotropy exists in the strength ε_s-ε_∞ and the characteristic relaxation frequency of the dispersion. The strength is higher within the c-plane than along the c-axis, while the characteristic frequency is much larger along the c-axis than within the c-plane. The dielectric dispersion in the polycrystalline sample cannot be explained by a simple average of the single crystal results. The observed dispersion is qualitatively discussed with a model of domain wall motion on an assumption that ErFe_2O_4 is a polar crystal.
社団法人日本物理学会の論文
1995-04-15