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Magnetic properties of single crystalline Lu$$_{2}$$Fe$$_{3}$$O$$_{7}$$

単結晶Lu$$_{2}$$Fe$$_{3}$$O$$_{7}$$の磁性

吉井 賢資  ; 池田 直*; 福山 諒太*; 永田 知子*; 神戸 高志*; 米田 安宏   ; 福田 竜生  ; 森 茂生*

Yoshii, Kenji; Ikeda, Naoshi*; Fukuyama, Ryota*; Nagata, Tomoko*; Kambe, Takashi*; Yoneda, Yasuhiro; Fukuda, Tatsuo; Mori, Shigeo*

標記物質の磁性を調べた。Lu$$_{2}$$Fe$$_{3}$$O$$_{7}$$は、われわれが発見した電子強誘電体RFe$$_{2}$$O$$_{4}$$(R:希土類)と共通する結晶構造を持ち、その物性は興味深いが、これまで余り調べられていない。磁化測定から、磁気転移温度は270K近傍で起こり、この温度は対応するRFe$$_{2}$$O$$_{4}$$であるLuFe$$_{2}$$O$$_{4}$$の240Kより高い。交流磁化測定などから、この系では乱れあるいは不均一性が重要な系であることがわかった。この特徴により、室温直下での広い温度幅での磁気冷却が可能であることを見いだした。これらの性質は、基礎的にも応用的にも興味深い。

The rare-earth iron oxides R$$_{2}$$Fe$$_{3}$$O$$_{7}$$ (R=Yb and Lu) are materials closely related to a multiferroic system RFe$$_{2}$$O$$_{4}$$, which shows a new type of ferroelectiricy (i.e., electronic ferroelectiricy) at 330 K owing to real-space charge ordering of Fe ions. In this work, we have investigated detailed magnetic properties of a single crystalline LuFe$$_{3}$$O$$_{7}$$. It was found that this oxide shows the magnetic transition temperature of 270 K, which is higher than that of the corresponding RFe$$_{2}$$O$$_{4}$$ (LuFe$$_{2}$$O$$_{4}$$), 240-250 K. AC magnetic susceptibility measurements exhibited spin-glass behavior at around the magnetic transition temperature. In addition, exchange bias and magnetocaloric effect were observed at low temperatures, similarly to RFe$$_{2}$$O$$_{4}$$. These phenomena are explained in connection with several factors, such as a coexistence of ferromagnetic and antiferromagnetic interactions between Fe ions.

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