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Journal Articles

Intermetallic charge transfer in MTiO$$_{3}$$ (M = Mn, Fe, Co, and Ni) by Ti2p edge resonant inelastic X-ray scattering

Agui, Akane; Mizumaki, Masaichiro*; Uozumi, Takayuki*

Journal of Electron Spectroscopy and Related Phenomena, 205, p.106 - 110, 2015/11

 Times Cited Count:5 Percentile:34.04(Spectroscopy)

In this study, we have measured the Ti 2p edge resonant inelastic X-ray scattering spectra of MTiO3 (M= Mn, Fe, Co, and Ni) in order to investigate the intermetallic M 3d-Ti 3d charge transfer. We found the peak around -4.5 eV in the energy loss scale for all MTiO$$_{3}$$ and additionally found that only FeTiO$$_{3}$$ has a peak at at -2.5 eV. Those peaks are attributed to the M 3d-Ti 3d charge transfer.

Journal Articles

Electronic structure of BaFeO$$_{3}$$ studied by X-ray spectroscopy

Mizumaki, Masaichiro*; Fujii, Hitoshi*; Yoshii, Kenji; Hayashi, Naoaki*; Saito, Takashi*; Shimakawa, Yuichi*; Uozumi, Takayuki*; Takano, Mikio*

Physica Status Solidi (C), 12(6), p.818 - 821, 2015/06

 Times Cited Count:8 Percentile:94.79

We investigated the electronic structure of BaFeO$$_{3}$$ by using HAXPES and XAS measurements and first principle studies. The experimental and theoretical results indicated that BaFeO$$_{3}$$ is a negative charge transfer compound. We concluded that the on-site Coulomb energy and the strong hybridization between Fe-3d and O-2p orbitals play a very important role of emergence of negative charge transfer. And we found the new structure in the Fe-2p XPS spectrum and concluded this structure is originated from non-local screening.

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:27.38(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

Intermetallic charge transfer in FeTiO$$_{3}$$ probed by resonant inelastic soft X-ray scattering

Agui, Akane; Uozumi, Takayuki*; Mizumaki, Masaichiro*; K$"a$$"a$mbre, T.*

Physical Review B, 79(9), p.092402_1 - 092402_4, 2009/03

AA2008-0923.pdf:0.24MB

 Times Cited Count:19 Percentile:62.64(Materials Science, Multidisciplinary)

We studied the electronic structure of FeTiO$$_{3}$$. The experimental technique used in this study was Ti 2$$p$$ soft resonant X-ray inelastic scattering spectroscopy (RIXS) and it was carried out at I511-3 at MAX-lab. FeTiO$$_{3}$$ has the ilmenite structure and this is an ordered corundum structure. Ions of Fe and Ti occupy the basal cation planes alternatively in which Fedivalent and Ti is tetravalent. Local symmetry around transition metal ions, both Fe and Ti, are in the distorted Oh symmetry. Butorin et al had reported the RIXS spectra of Ti La,b (Phy. Rev. B55 (1997) 4242) in the 3$$d$$$$^{0}$$ compounds and discussed the charge-transfer transitions from Ti 3$$d$$ - O 2$$p$$ hybridization. In this study, we measured Ti La,b RIXS of FeTiO$$_{3}$$ in detail and the spectra shows rich resonant feature. When the excitation energy is tuned at the well-defined $$e$$$$_{g}$$ peak of Ti L3 X-ray absorption spectrum (XAS), a clear small peak appears at 2.5 eV below from the elastic peak. An additional peak comes up at 4.5 eV below the elastic peak when the excitation energy is tuned at the well defined $$t$$$$_{2g}$$ peak of XAS. The spectral features are attributed to eg and $$t$$$$_{2g}$$ state of Ti 3$$d$$ due to crystal field and charge transfer between Ti 3$$d$$ and O 2$$p$$. We are analyzing the RIXS spectra within the cluster model in order to investigate the clear resonant peaks. By demonstrating a double-cluster model calculation taking into account offull-multiplet, we conclude that the origin of features are attributed to Fe 3$$d$$ $$rightarrow$$ Ti 3$$d$$ charge transfer process with $$d$$-$$d$$ charge transfer form Fe to Ti, e.g. it is due to inter-metallic charge transfer, which is a new essential elementary optical process in RIXS study.

Journal Articles

Admixture of excited states and ground states of a Eu$$^{3+}$$ ion in Eu$$_{3}$$Fe$$_{5}$$O$$_{12}$$ by means of magnetic circular dichroism

Mizumaki, Masaichiro*; Uozumi, Takayuki*; Agui, Akane; Kawamura, Naomi*; Nakazawa, Makoto*

Physical Review B, 71(13), p.134416_1 - 134416_8, 2005/04

 Times Cited Count:14 Percentile:53.02(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Theoretical and experimental study of resonant $$3d$$ X-ray photoemission and resonant $$L_{3}M_{45}M_{45}$$ Auger transition of PdO

Uozumi, Takayuki*; Okane, Tetsuo; Yoshii, Kenji; Sasaki, Teikichi; Kotani, Akio*

Journal of the Physical Society of Japan, 69(4), p.1226 - 1233, 2000/04

 Times Cited Count:8 Percentile:53.42(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Cluster model calculations for the Fe L$$_{2,3}$$-edge fine structure of $$alpha$$-Fe$$_{2}$$O$$_{3}$$

Kurata, Hiroki; Hojo, Kiichi; Uozumi, Takayuki*

Journal of Electron Microscopy, 47(4), p.293 - 299, 1998/00

 Times Cited Count:4 Percentile:17.64(Microscopy)

no abstracts in English

Oral presentation

The Origin of the excited states in Eu$$^{3+}$$ ions

Mizumaki, Masaichiro*; Agui, Akane; Yoshii, Kenji; Uozumi, Takayuki*

no journal, , 

no abstracts in English

Oral presentation

Study of admixture of thermal and magnetic excited state in ground state of Eu$$^{3+}$$ in magnetic materials

Agui, Akane; Kawamura, Naomi*; Mizumaki, Masaichiro*; Uozumi, Takayuki*

no journal, , 

no abstracts in English

Oral presentation

Electronic Structure of 3d in Fe$$^2$$$$^+$$ and Fe$$^3$$$$^+$$of LuFe$$_2$$O$$_4$$

Agui, Akane; Ikeda, Naoshi*; Morimoto, Masanori*; Uozumi, Takayuki*; Kaamber, T.*

no journal, , 

no abstracts in English

Oral presentation

Electronic structure of Cr ions in spinel ferrite CrFe$$_{2}$$O$$_{4}$$

Mizumaki, Masaichiro*; Uozumi, Takayuki*; Agui, Akane; Kawamura, Naomi*

no journal, , 

no abstracts in English

Oral presentation

Inter matallic charge transfer in ilmenite family

Agui, Akane; Mizumaki, Masaichiro*; Uozumi, Takayuki*

no journal, , 

no abstracts in English

Oral presentation

Inter-metallic charge-transfer excitation in ilmenite compounds

Agui, Akane; Uozumi, Takayuki*; Mizumaki, Masaichiro*; Kaamber, T.*

no journal, , 

no abstracts in English

Oral presentation

Inter-metallic charge-transfer excitation in ilmenite compounds

Agui, Akane; Uozumi, Takayuki*; Mizumaki, Masaichiro*; Kaamber, T.*

no journal, , 

no abstracts in English

Oral presentation

Inter-metallic charge transfer in ilmenites

Agui, Akane; Uozumi, Takayuki*; Mizumaki, Masaichiro*; Kaamber, T.*

no journal, , 

no abstracts in English

Oral presentation

Direct observation of dd excitation in KCuF$$_{3}$$

Mizumaki, Masaichiro*; Agui, Akane; Kawamura, Naomi*; Uozumi, Takayuki*; Murakami, Yoichi*

no journal, , 

no abstracts in English

Oral presentation

Direct observation of the Ni-3d electronic states change in PrNiO$$_{3}$$

Mizumaki, Masaichiro*; Agui, Akane; Saito, Takashi*; Azuma, Masaki*; Shimakawa, Yuichi*; Takano, Mikio*; Uozumi, Takayuki*

no journal, , 

no abstracts in English

Oral presentation

Soft X-ray emission spectroscopy of SrFeO$$_{2}$$

Mizumaki, Masaichiro*; Agui, Akane; Uozumi, Takayuki*; Inoue, Akira*; Kawai, Masanori*; Ichikawa, Noriya*; Shimakawa, Yuichi*

no journal, , 

no abstracts in English

Oral presentation

Study of admixture of thermal excited state in ground state of Eu$$^{3+}$$ in Eu$$_3$$Fe$$_5$$O$$_{12}$$ by 4f$$to$$3d X-ray emission spectroscopy

Agui, Akane; Uozumi, Takayuki*; Mizumaki, Masaichiro*; Kawamura, Naomi*

no journal, , 

no abstracts in English

Oral presentation

Electronic structure of Fe 3$$d$$ in Fe$$^{2+}$$ and Fe$$^{3+}$$ of LuFe$$_{2}$$O$$_{4}$$

Agui, Akane; Mizumaki, Masaichiro*; Ikeda, Naoshi*; Uozumi, Takayuki*; K$"a$$"a$mbre, T.*

no journal, , 

The charge-frustrated system Lu Fe$$_{2}$$O$$_{4}$$ is characterized by a regular arrangement of Fe$$^{2+}$$ and Fe$$^{3+}$$ ions on the frustrated triangle lattice and it had reported the charge order of Fe$$^{2+}$$ and Fe$$^{3+}$$ causes its ferroelectricity. In order to investigate the Fe 3$$d$$ state in the frustrated system, Fe La,b emission spectra and Fe L2,3 absorption spectra of LuFe$$_{2}$$+Fe$$_{3}$$+O$$_{4}$$, LuGaFe$$_{2}$$+O$$_{4}$$ and LuFe$$_{3}$$+CoO$$_{4}$$ at I511-3 at MAXLAB and 7.0.1 at ALS. It was found that the profile of Fe La,b emission spectra of LuFe$$^{2+}$$Fe$$^{3+}$$O$$_{4}$$ is not simple superposition of Fe$$^{2+}$$ and Fe$$^{3+}$$ electronic states.

25 (Records 1-20 displayed on this page)