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Journal Articles

Temperature and polarization dependence of Fe L$$_{3}$$-edge X-ray absorption spectra of LuFe$$_{2}$$O$$_{4}$$

Agui, Akane; Mizumaki, Masaichiro*; Kuroda, Tomoko*; Kawai, Masahiro*; Nagata, Tomoko*; Ikeda, Naoshi*; Uozumi, Takayuki*

Journal of Electron Spectroscopy and Related Phenomena, 197, p.13 - 16, 2014/12

 Times Cited Count:4 Percentile:29.63(Spectroscopy)

In this paper, we report on the study of the temperature dependence of Fe L$$_{3}$$-edge X-ray absorption spectra (XAS) of LuFe$$_{2}$$O$$_{4}$$. In the charge ordered state the valence of Fe is in Fe$$^{2+}$$ and Fe$$^{3+}$$. And the Fe L$$_{3}$$-edge XAS spectra have double peak structure which is attributed the Fe$$^{2+}$$ and Fe$$^{3+}$$ state. In high temperature, the double peak structure becomes indistinct because the thermal excited state overlaps while the Fe valence keeping the integer number.

Journal Articles

Stoichiometric study of the dielectric and magnetic properties in charge frustrated system LuFe$$_{2}$$O$$_{4}$$

Michiuchi, Takamasa*; Yokota, Yusuke*; Komatsu, Takuma*; Hayakawa, Hironori*; Kuroda, Tomoko*; Maeda, Daisuke*; Matsuo, Yoji*; Mori, Shigeo*; Yoshii, Kenji; Hanasaki, Noriaki*; et al.

Ferroelectrics, 378(1), p.175 - 180, 2009/00

 Times Cited Count:18 Percentile:62.21(Materials Science, Multidisciplinary)

We have synthesized the samples of LuFe$$_{2}$$O$$_{4}$$, which shows the ferroelectricity due to charge ordering of Fe ions, under several different reducing conditions using a CO$$_{2}$$-CO flow. The reducing condition was changed by changing a flow ratio of CO$$_{2}$$ and CO. It was found that the flow ratio of CO$$_{2}$$/CO of about 5 provided the sample with the highest magnetic transition temperature of 240-250 K. This sample showed the dielectric constant of 10000 at room temperature. The imaginary part of the dielectric response offered the activation energy of 0.4-0.5 eV, which is slightly larger than that reported previously (about 0.3 eV). We will perform further investigation of the physical properties of this sample to clarify full details and their origin of LuFe$$_{2}$$O$$_{4}$$.

Oral presentation

Fe 3p-$$>$$1s X-ray resonant emission spectroscopy of LuFe$$_{2}$$O$$_{4}$$ single crystal

Agui, Akane; Mizumaki, Masaichiro*; Kawamura, Naomi*; Kuroda, Tomoko*; Hayakawa, Hironori*; Maeda, Daisuke*; Michiuchi, Takamasa*; Ikeda, Naoshi*

no journal, , 

no abstracts in English

Oral presentation

Magnetic properties and electronic properties of LuGaFeO$$_{4}$$

Kuroda, Tomoko*; Fukuyama, Ryota*; Kitamura, Satoshi*; Matsuo, Yoji*; Ikeda, Naoshi*; Kambe, Takashi*; Agui, Akane; Kimizuka, Noboru*

no journal, , 

no abstracts in English

Oral presentation

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

Fukuyama, Ryota*; Yoshii, Kenji; Kuroda, Tomoko*; Kitamura, Satoshi*; Funae, Takeshi*; Matsuo, Yoji*; Ikeda, Naoshi*; Kimizuka, Noboru*; Kambe, Takashi*

no journal, , 

We have investigated the physical properties of Lu$$_{2}$$Fe$$_{3}$$O$$_{7}$$, which has a related structure to the electronic ferroelectric RFe$$_{2}$$O$$_{4}$$ (R: rare earths). Magnetic measurements showed that its magnetic transition temperature was about 260-270 K. Dielectric measurements showed that dielectric constants at room temperature were about 10000. This material also showed a magneto-dielectric effect at around room temperature, a result which is interesting from the viewpoints of both fundamental and applied science.

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