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Magnetic ordering process in the charge-frustrated ferroelectric system LuFe$$_{2}$$O$$_{4}$$

Kakurai, Kazuhisa; Ikeda, Naoshi*; Nagai, Satoshi*; Matsuda, Masaaki; Ishii, Yoshinobu; Owada, Kenji; Inami, Toshiya; Yoshii, Kenji  ; Murakami, Yoichi*; Kito, Hijiri*; Yamada, Yasusada*

We report in this paper an anomalous magnetic ordering process in the charge ordered LuFe$$_{2}$$O$$_{4}$$. The neutron scattering experiments were performed on TAS-1 and TAS-2 instruments installed at JAEA-JRR-3. The following results are obtained:1) Despite the triangular configuration a strong 2-D antiferromagnetic correlation with ferrimagnetic component in the double layer in the hexagonal plane develops to a 3-D order along the c-axis at T$$_{N}$$=242K.2) At around 177K there is another characteristic temperature T$$_{f}$$, where new type of broad magnetic peaks start to grow and at the same time the magnetic peaks already developed below T$$_{N}$$ also acquire finite line width, including the peaks due to the ferrimagnetic component. A strong hysteresis is observed at T$$_{f}$$. The existence of the anomalous magnetic ground state will be demonstrated and the possible relation to the orbital degree of freedom will be discussed.

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