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Doping effect on the charge ordering in LuFe2O4

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

Change of the charge ordered (CO) structure by substituting Cu$$^{2+}$$ for Fe$$^{2+}$$ in LuFe$$_{2}$$O$$_{4}$$ was investigated by means of the transmission electron microscopy. The CO structure in LuFe$$_{2}$$O$$_{4}$$ is characterized by the modulated structure with the wave vector of q=1/3[1 -1 3/2] and the average size of the CO domains can be estimated to be about 10-20nm. On the contrary, the Cu$$^{2+}$$ substitution destroyed the CO structure drastically and induced characteristic local lattice distortion, which gives rise to characteristic diffuse scattering in the reciprocal space. High-resolution lattice images revealed that there exist nano-scale clusters, which are characterized as the short-range ordering of the Cu$$^{2+}$$ and Fe$$^{3+}$$ ions on the triangular lattice. In addition, the magnetic measurement revealed that LuFeCuO$$_{4}$$ exhibits an antiferromagnetic transition around 50K, which is lower than the Neel temperature of 250K in LuFe$$_{2}$$O$$_{4}$$.



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