JOPSS - Search Results

Journal Articles

Observation of momentum-resolved charge fluctuations proximate to the charge-order phase using resonant inelastic X-ray scattering

Yoshida, Masahiro*; Ishii, Kenji; Naka, Makoto*; Ishihara, Sumio*; Jarrige, I.*; Ikeuchi, Kazuhiko*; Murakami, Yoichi*; Kudo, Kazutaka*; Koike, Yoji*; Nagata, Tomoko*; et al.

Scientific Reports (Internet), 6, p.23611_1 - 23611_8, 2016/03

https://doi.org/10.1038/srep23611

Times Cited Count：1 Percentile：10.95(Multidisciplinary Sciences)

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

https://doi.org/10.1016/j.elspec.2014.08.008

Times Cited Count：4 Percentile：23.96(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

Magnetic properties of R $_{2}$ Fe $_{3}$ O $_{7}$ (R=Yb and Lu)

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

Solid State Communications, 173, p.34 - 37, 2013/11

https://doi.org/10.1016/j.ssc.2013.08.030

Times Cited Count：4 Percentile：19.58(Physics, Condensed Matter)

We have investigated the magnetic properties of R $_{2}$ Fe $_{3}$ O $_{7}$ (R=Yb and Lu), which belongs to the homologous family of electronic ferroelectric RFe $_{2}$ O $_{4}$ . Magnetization measurements show ferrimagnetic ordering at the Neel temperature (T $_{N}$ ) of about 270 K, which is slightly higher than that of RFe $_{2}$ O $_{4}$ (T $_{N}$ about 230-250 K). Observation of spin glass and exchange bias shows a coexistence of ferromagnetic and antiferromagneticinteractions, similarly to RFe $_{2}$ O $_{4}$ . This situation gives rise to a complex magnetic change and a broad peak of magnetic entropy change. Some characteristics, such as refrigeration temperatures higher than in RFe $_{2}$ O $_{4}$ , seem to offer a possibility of this system to applications.

Journal Articles

Magnetoelectric effect driven by magnetic domain modification in LuFe $_{2}$ O $_{4}$

Kambe, Takashi*; Fukada, Yukimasa*; Kano, Jun*; Nagata, Tomoko*; Okazaki, Hiroyuki*; Yokoya, Takayoshi*; Wakimoto, Shuichi; Kakurai, Kazuhisa; Ikeda, Naoshi*

Physical Review Letters, 110(11), p.117602_1 - 117602_5, 2013/03

https://doi.org/10.1103/PhysRevLett.110.117602

Times Cited Count：25 Percentile：75.30(Physics, Multidisciplinary)

Journal Articles

Exchange bias in multiferroic Fe $_{2}$ O $_{4}$ (=Y, Er, Tm, Yb, Lu and In)

Yoshii, Kenji; Ikeda, Naoshi*; Nishihata, Yasuo; Maeda, Daisuke*; Fukuyama, Ryota*; Nagata, Tomoko*; Kano, Jun*; Kambe, Takashi*; Horibe, Yoichi*; Mori, Shigeo*

Journal of the Physical Society of Japan, 81(3), p.033704_1 - 033704_4, 2012/03

https://doi.org/10.1143/JPSJ.81.033704

Times Cited Count：10 Percentile：54.68(Physics, Multidisciplinary)

Exchange bias (EB) behavior has been observed for multiferroic Fe $_{2}$ O $_{4}$ (=Y, Er, Tm, Yb, Lu and In). The materials with the small $^{3+}$ ions (=Tm, Yb, Lu and In) exhibit large EB fields ( $_sim^{>}$ 1 kOe) below 100-150 K. This property is rooted in a magnetically glassy state, arising from the competition between ferro- and antiferromagnetic domain interactions. In addition, the exchange bias field tends to be more enhanced for smaller $^{3+}$ ions. Hence, the EB is controlled by the substitution at the -site in this series.

Oral presentation

Temperature dependence of Fe2p-edge XES of LuFe $_{2}$ O $_{4}$ , 2

Agui, Akane; Kawai, Masahiro*; Nagata, Tomoko*; Mizumaki, Masaichiro*; Izumi, Yudai*; Ikeda, Naoshi*

no journal, ,

no abstracts in English

Oral presentation

The Non-local emission process among Fe $^{2+}$ and Fe $^{3+}$ in LuFeO

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

no journal, ,

We have measured the resonant Fe L2,3 emission spectra of LuFeO. The charge order temperature is Tco = 320 K and the $^{2+}$ and $^{3+}$ arrange alternately in the charge ordered phase. We found that the spectrum at T Tco could not be explained only by the simple sum of spectra from the $_{2+}$ and $_{3+}$ sites. We assumed that when an Fe 2p state was excited, the electron transited not only to the on-state Fe 3d state but also to the neighboring Fe 3d state. This intermediate interference made the new spectra shape.

Oral presentation

The Fe2p-edge emission spectra of RFeO

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

no journal, ,

no abstracts in English

Oral presentation

Temperature dependence of Fe2p X-ray-emission spectra of LuFeO

Agui, Akane; Nagata, Tomoko*; Mizumaki, Masaichiro*; Ikeda, Naoshi*

no journal, ,

no abstracts in English

Oral presentation

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

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

no journal, ,

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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Observation of momentum-resolved charge fluctuations proximate to the charge-order phase using resonant inelastic X-ray scattering

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

Magnetic properties of R $_{2}$ Fe $_{3}$ O $_{7}$ (R=Yb and Lu)

Magnetoelectric effect driven by magnetic domain modification in LuFe $_{2}$ O $_{4}$

Exchange bias in multiferroic Fe $_{2}$ O $_{4}$ (=Y, Er, Tm, Yb, Lu and In)

Temperature dependence of Fe2p-edge XES of LuFe $_{2}$ O $_{4}$ , 2

The Non-local emission process among Fe $^{2+}$ and Fe $^{3+}$ in LuFeO

The Fe2p-edge emission spectra of RFeO

Temperature dependence of Fe2p X-ray-emission spectra of LuFeO

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