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Agui, Akane; Mizumaki, Masaichiro*; Uozumi, Takayuki*
Journal of Electron Spectroscopy and Related Phenomena, 205, p.106 - 110, 2015/11
Times Cited Count:7 Percentile:38.95(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 and additionally found that only FeTiO has a peak at at -2.5 eV. Those peaks are attributed to the M 3d-Ti 3d charge transfer.
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:10 Percentile:93.86(Physics, Condensed Matter)We investigated the electronic structure of BaFeO by using HAXPES and XAS measurements and first principle studies. The experimental and theoretical results indicated that BaFeO 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.
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:23.96(Spectroscopy)In this paper, we report on the study of the temperature dependence of Fe L-edge X-ray absorption spectra (XAS) of LuFeO. In the charge ordered state the valence of Fe is in Fe and Fe. And the Fe L-edge XAS spectra have double peak structure which is attributed the Fe and Fe state. In high temperature, the double peak structure becomes indistinct because the thermal excited state overlaps while the Fe valence keeping the integer number.
Agui, Akane; Uozumi, Takayuki*; Mizumaki, Masaichiro*; Kmbre, T.*
Physical Review B, 79(9), p.092402_1 - 092402_4, 2009/03
Times Cited Count:20 Percentile:61.71(Materials Science, Multidisciplinary)We studied the electronic structure of FeTiO. The experimental technique used in this study was Ti 2 soft resonant X-ray inelastic scattering spectroscopy (RIXS) and it was carried out at I511-3 at MAX-lab. FeTiO 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 compounds and discussed the charge-transfer transitions from Ti 3 - O 2 hybridization. In this study, we measured Ti La,b RIXS of FeTiO in detail and the spectra shows rich resonant feature. When the excitation energy is tuned at the well-defined 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 peak of XAS. The spectral features are attributed to eg and state of Ti 3 due to crystal field and charge transfer between Ti 3 and O 2. 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 Ti 3 charge transfer process with - 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.
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:51.41(Materials Science, Multidisciplinary)no abstracts in English
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:9 Percentile:55.10(Physics, Multidisciplinary)no abstracts in English
Kurata, Hiroki; Hojo, Kiichi; Uozumi, Takayuki*
Journal of Electron Microscopy, 47(4), p.293 - 299, 1998/00
Times Cited Count:6 Percentile:24.84(Microscopy)no abstracts in English
Agui, Akane; Kawamura, Naomi*; Mizumaki, Masaichiro*; Uozumi, Takayuki*
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Agui, Akane; Ikeda, Naoshi*; Morimoto, Masanori*; Uozumi, Takayuki*; Kaamber, T.*
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Mizumaki, Masaichiro*; Uozumi, Takayuki*; Agui, Akane; Kawamura, Naomi*
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Agui, Akane; Uozumi, Takayuki*; Mizumaki, Masaichiro*; Kaamber, T.*
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Agui, Akane; Uozumi, Takayuki*; Mizumaki, Masaichiro*; Kaamber, T.*
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Mizumaki, Masaichiro*; Agui, Akane; Uozumi, Takayuki*; Inoue, Akira*; Kawai, Masanori*; Ichikawa, Noriya*; Shimakawa, Yuichi*
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Agui, Akane; Mizumaki, Masaichiro*; Uozumi, Takayuki*
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Mizumaki, Masaichiro*; Agui, Akane; Yoshii, Kenji; Uozumi, Takayuki*
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Agui, Akane; Uozumi, Takayuki*; Mizumaki, Masaichiro*; Kaamber, T.*
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Mizumaki, Masaichiro*; Agui, Akane; Kawamura, Naomi*; Uozumi, Takayuki*; Murakami, Yoichi*
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Mizumaki, Masaichiro*; Agui, Akane; Saito, Takashi*; Azuma, Masaki*; Shimakawa, Yuichi*; Takano, Mikio*; Uozumi, Takayuki*
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Agui, Akane; Uozumi, Takayuki*; Mizumaki, Masaichiro*; Kawamura, Naomi*
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Agui, Akane; Mizumaki, Masaichiro*; Uozumi, Takayuki*
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