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Report No.

Magnetic and dielectric properties of Lu$$_{2}$$Fe$$_{3}$$O$$_{7}$$

Fukada, Yukimasa*; Yoshii, Kenji  ; Fujiwara, Kosuke*; Hayashi, Naoaki*; Fukuda, Tatsuo  ; Mizumaki, Masaichiro*; Shigematsu, Kei*; Azuma, Masaki*; Takeda, Masayasu  ; Ikeda, Naoshi*

Magnetic and dielectric properties were investigated for poly and single crystalline Lu$$_{2}$$Fe$$_{3}$$O$$_{7}$$, a related oxide to the electronic ferroelectric RFe$$_{2}$$O$$_{4}$$ (R: rare earths). The magnetization measurements showed a ferrimagnetic transition at T$$_{N}$$=270 K. In addition, the temperature derivative showed the existence of a multiple magnetic transition. With cooling the sample, a broad transition occurs at 250-270 K, below which a sharp transition is observed. This result likely indicates the presence of multiple magnetic phases, rooted in the geometrical frustration on the triangular lattice. The dielectric measurements showed a possible correlation between magnetic and dielectric properties at about 120 K, at which both magnetization and AC susceptibility showed broad maxima. The other results will be presented at the conference.



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