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Dilution effect on microstructures with respect to magnetic and dielectric properties in charge-ordered ferroelectric LuFe$$_{2}$$O$$_{4}$$

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

We investigated magnetic/dielectric properties and related microstructures in LuFeCuO$$_{4}$$, which was obtained by substituting Cu$$^{2+}$$ ion for Fe$$^{2+}$$ one in LuFe$$_{2}$$O$$_{4}$$. It was found that LuFeCuO$$_{4}$$ shows a characteristic low-frequency dielectric dispersion around 300 K. We analyzed it by using the Debye model and found that LuFeCuO$$_{4}$$ is adielectric compound with the orientational polarization. Electron diffraction experiments revealed that there exists characteristic zigzag-shaped diffuse scattering in LuFeCuO$$_{4}$$. In addition, we found the presence of nano-sized domains, which consist of the short-range ordering of Fe$$^{3+}$$ and Cu$$^{2+}$$ on the triangular lattice. The present results suggest that the short-range ordering gives rise to some anomalous dielectric properties in LuFeCuO$$_{4}$$.

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