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Journal Articles

Magnetic and dielectric study of Bi$$_{2}$$CuO$$_{4}$$

Yoshii, Kenji; Fukuda, Tatsuo; Akahama, Hiroshi*; Kano, Jun*; Kambe, Takashi*; Ikeda, Naoshi*

Physica C, 471(21-22), p.766 - 769, 2011/11

https://doi.org/10.1016/j.physc.2011.05.049
 Times Cited Count：20 Percentile：61.17(Physics, Applied)

We have investigated the magnetic and dielectric properties of Bi$$_{2}$$CuO$$_{4}$$, which has the same chemical formula as that of the parent materials of high-Tc superconductors, R$$_{2}$$CuO$$_{4}$$ (R: rare earths). Magnetic measurements showed that this oxide exhibits an antiferromagnetic transition at around 40 K, owing to the localized Cu$$^{2+}$$ spins. Dielectric constants were found to be about 100 at room temperature, which are smaller than those of R$$_{2}$$CuO$$_{4}$$ (about 10000 at room temperature). The imaginary part of dielectric response showed the activation energy of about 0.1 eV, suggesting that the dielectric response is brought about by a transfer of Cu-3d electrons.

Journal Articles

Multiferroic character and magnetic phase of LuFe$$_{2}$$O$$_{4}$$

Oishi, Daisuke*; Hayakawa, Hironori*; Akahama, Hiroshi*; Ikeda, Naoshi*; Kambe, Takashi*; Matsuo, Yoji*; Kimizuka, Noboru*; Kano, Jun*; Yoshii, Kenji

Ferroelectrics, 415(1), p.51 - 56, 2011/10

https://doi.org/10.1080/00150193.2011.577371
 Times Cited Count：5 Percentile：25.28(Materials Science, Multidisciplinary)

The variation of AC dielectric constant in the function of the DC magnetic fields was found in low oxygen vacant LuFe$$_{2}$$O$$_{4}$$ single crystal in which the electric polarization arise from the polar charge ordering. These magneto-electric coupling should be explained by a novel mechanism where the boundary motion of the polar charge ordered domain is affected by the magnetic (spin) domain boundary motion.

Oral presentation

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*

no journal, , 

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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