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Magnetic/dielectric properties and charge ordering phenomenain YbFe$$_{2-x}$$Mn$$_{x}$$O$$_{4}$$, 2

Matsumoto, Keisuke*; Hoshiyama, Takuya*; Oishi, Daisuke*; Akahama, Hiroshi*; Yoshii, Kenji; Kano, Jun*; Hanasaki, Noriaki*; Kambe, Takashi*; Ikeda, Naoshi*; Mori, Shigeo*

We have investigated the physical properties of YbFe$$_{2-x}$$Mn$$_{x}$$O$$_{4}$$, a derivative system of the electronic ferroelectric RFe$$_{2}$$O$$_{4}$$ (R: rare earths). Electron diffraction measurements showed taht long-range charge ordering of the Fe-3d charges was observed at room temperature for x=0; this ordering is the origin of ferroelectricity. The x=0.1 oxide showed diffuse scattering patterns at room temperature, instead of the charge-ordered pattern. Thus, 5% Mn substitution can collapse the long-range charge ordering. We will also present the correlation between the magnetic/dielectric properties and the crystal structure.

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