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Nomura, Takuji*; Harada, Yoshihisa*; Niwa, Hideharu*; Ishii, Kenji*; Ishikado, Motoyuki*; Shamoto, Shinichi; Jarrige, I.*
Physical Review B, 94(3), p.035134_1 - 035134_9, 2016/07
Times Cited Count:10 Percentile:46.75(Materials Science, Multidisciplinary)Low-energy electron excitation spectra were measured on a single crystal of a typical iron-based superconductor PrFeAsO using resonant inelastic X-ray scattering (RIXS) at the Fe-
edge.
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
Times Cited Count:1 Percentile:12.19(Multidisciplinary Sciences)Gretarsson, H.*; Nomura, Takuji; Jarrige, I.*; Lupascu, A.*; Upton, M. H.*; Kim, J.*; Casa, D.*; Gog, T.*; Yuan, R. H.*; Chen, Z. G.*; et al.
Physical Review B, 91(24), p.245118_1 - 245118_8, 2015/06
Times Cited Count:6 Percentile:29.49(Materials Science, Multidisciplinary)Wray, L. A.*; Huang, S.-W.*; Jarrige, I.*; Ikeuchi, Kazuhiko*; Ishii, Kenji; Li, J.*; Qiu, Z. Q.*; Hussain, Z.*; Chuang, Y.-D.*
Frontiers in Physics (Internet), 3, p.32_1 - 32_11, 2015/05
Times Cited Count:4Jarrige, I.*; Kotani, Akio*; Yamaoka, Hitoshi*; Tsujii, Naohito*; Ishii, Kenji; Upton, M.*; Casa, D.*; Kim, J. H.*; Gog, T.*; Hancock, J. N.*
Physical Review Letters, 114(12), p.126401_1 - 126401_5, 2015/03
Times Cited Count:9 Percentile:57.53(Physics, Multidisciplinary)Jarrige, I.*; Ishii, Kenji; Matsumura, Daiju; Nishihata, Yasuo; Yoshida, Masahiro*; Kishi, Hirofumi*; Taniguchi, Masashi*; Uenishi, Mari*; Tanaka, Hirohisa*; Kasai, Hideaki*; et al.
ACS Catalysis, 5(2), p.1112 - 1118, 2015/02
Times Cited Count:16 Percentile:42.38(Chemistry, Physical)Yoshii, Kenji; Yoneda, Yasuhiro; Jarrige, I.*; Fukuda, Tatsuo; Nishihata, Yasuo; Suzuki, Chikashi; Ito, Yoshiaki*; Terashima, Takahito*; Yoshikado, Shinzo*; Fukushima, Sei*
Journal of Physics and Chemistry of Solids, 75(3), p.339 - 343, 2014/03
Times Cited Count:9 Percentile:40.44(Chemistry, Multidisciplinary)We have studied the electronic properties of ferroelectric BaTiO using two complementary bulk-sensitive spectroscopic probes, resonant X-ray emission spectroscopy (RXES) and X-ray absorption spectroscopy in the partial fluorescence mode (PFY-XAS). Contrary to a previous study, we found no temperature change of a PFY-XAS spectrum at the Ba L
edge between room temperature and 150
C. This result is not supportive of the possible presence of the displacement around Ba
at the Curie temperature. RXES spectra were measured at the Ti K edge for BaTiO
, along with SrTiO
and La-doped metallic SrTiO
. The photon energy of the emission peak is found to be nearly constant throughout the absorption edge for all three compounds. We deduce the Ti 3d states to have a delocalized character, in contrast with the Ba 5d states, a property which is consistent with the proposed scenario of the formation of electric dipoles in BaTiO
.
Yoshida, Masahiro*; Ishii, Kenji; Jarrige, I.*; Watanuki, Tetsu; Kudo, Kazutaka*; Koike, Yoji*; Kumagai, Kenichi*; Hiraoka, Nozomu*; Ishii, Hirofumi*; Tsuei, K.-D.*; et al.
Journal of Synchrotron Radiation, 21(1), p.131 - 135, 2014/01
Times Cited Count:3 Percentile:19.86(Instruments & Instrumentation)Ishii, Kenji; Jarrige, I.*; Yoshida, Masahiro*; Ikeuchi, Kazuhiko*; Inami, Toshiya; Murakami, Yoichi*; Mizuki, Junichiro
Journal of Electron Spectroscopy and Related Phenomena, 188, p.127 - 132, 2013/06
Times Cited Count:13 Percentile:58.79(Spectroscopy)Yoshii, Kenji; Jarrige, I.; Suzuki, Chikashi; Matsumura, Daiju; Nishihata, Yasuo; Yoneda, Yasuhiro; Fukuda, Tatsuo; Tamura, Kazuhisa; Ito, Yoshiaki*; Mukoyama, Takeshi*; et al.
Journal of Physics and Chemistry of Solids, 73(9), p.1106 - 1110, 2012/09
Times Cited Count:11 Percentile:45.32(Chemistry, Multidisciplinary)We have directly probed the Ba 5d states in the ferroelectric barium titanate BaTiO using resonant X-ray emission spectroscopy (RXES) and X-ray absorption spectroscopy in the partial fluorescence mode (PFY-XAS) at the Ba-L
edge. The results are compared with those of the non-ferroelectric BaSO
. While the RXES spectra point to a localized character for the Ba 5d states in both compounds, the main peak of the PFY-XAS spectrum, corresponding to the dipolar transitions from 2p to 5d, is found to be significantly broader for BaTiO
than for BaSO
. On the basis of band structure calculations, this broadening is ascribed to strong hybridization between the unoccupied Ba 5d and O 2p states in the ferroelectric. This suggests that the hybridization between the conduction states of the Ba
and O
ions, and not only Ti
and O
, plays a central role in determining the electronic structure of BaTiO
.
Jarrige, I.*; Nomura, Takuji; Ishii, Kenji; Gretarsson, H.*; Kim, Y.-J.*; Kim, J.*; Upton, M.*; Casa, D.*; Gog, T.*; Ishikado, Motoyuki*; et al.
Physical Review B, 86(11), p.115104_1 - 115104_4, 2012/09
Times Cited Count:8 Percentile:36.36(Materials Science, Multidisciplinary)We report the first observation by momentum-resolved resonant inelastic X-ray scattering of charge excitations in an iron-based superconductor and its parent compound, PrFeAsO and PrFeAsO respectively, with two main results. First, using calculations based on a 16 band
model, we show that the energy of the lowest-lying excitations, identified as
interband transitions of dominant
,
orbital character, exhibits a dramatic dependence on electron correlation. This enables us to estimate the Coulomb repulsion
and Hund's coupling
, and to highlight the role played by
in these peculiar orbital-dependent electron correlation effects. Second, we show that short-range antiferromagnetic correlations, which are a prerequisite to the occurrence of these excitations at the
point, are still present in the superconducting state.
Ishii, Kenji; Tsutsui, Kenji; Ikeuchi, Kazuhiko*; Jarrige, I.; Mizuki, Junichiro; Hiraka, Haruhiro*; Yamada, Kazuyoshi*; Toyama, Takami*; Maekawa, Sadamichi; Endo, Yasuo*; et al.
Physical Review B, 85(10), p.104509_1 - 104509_5, 2012/03
Times Cited Count:3 Percentile:15.36(Materials Science, Multidisciplinary)Yoshii, Kenji; Jarrige, I.; Matsumura, Daiju; Nishihata, Yasuo; Suzuki, Chikashi; Ito, Yoshiaki*; Mukoyama, Takeshi*; Tochio, Tatsunori*; Shinotsuka, Hiroshi*; Fukushima, Sei*
Japanese Journal of Applied Physics, 50(9), p.09NE03_1 - 09NE03_4, 2011/09
Times Cited Count:2 Percentile:10.06(Physics, Applied)Resonant X-ray inelastic scattering experiments have been performed at the Ba-L edge in ferroelectric BaTiO
using synchrotron radiation at the BL15XU of SPring-8. An X-ray absorption spectrum of this material was found to be broader than non-ferroelectric BaSO
. Molecular orbital calculations showed the formation of Ba-O bands in BaTiO
, suggesting an important role of the Ba-O hybridization in the ferroelectric transition of this material. X-ray emission spectra at the edge showed a localized character of Ba-5d orbitals in BaTiO
in spite of the hybridization with O-3p. A few possible applications of the measurement will be also discussed.
Ishii, Kenji; Ishihara, Sumio*; Murakami, Yoichi*; Ikeuchi, Kazuhiko*; Kuzushita, Kaori*; Inami, Toshiya; Owada, Kenji; Yoshida, Masahiro; Jarrige, I.; Tatami, Naka*; et al.
Physical Review B, 83(24), p.241101_1 - 241101_4, 2011/06
Times Cited Count:21 Percentile:65.49(Materials Science, Multidisciplinary)Ishii, Kenji; Jarrige, I.; Yoshida, Masahiro; Ikeuchi, Kazuhiko*; Mizuki, Junichiro; Ohashi, Kei*; Takayama, Tomohiro*; Matsuno, Jobu*; Takagi, Hidenori*
Physical Review B, 83(11), p.115121_1 - 115121_5, 2011/03
Times Cited Count:69 Percentile:91(Materials Science, Multidisciplinary)Ishii, Kenji; Ikeuchi, Kazuhiko*; Jarrige, I.; Mizuki, Junichiro; Hiraka, Haruhiro*; Yamada, Kazuyoshi*; Tsutsui, Kenji; Toyama, Takami*; Maekawa, Sadamichi*; Endo, Yasuo*; et al.
Physica C, 470(Suppl.1), p.S155 - S157, 2010/12
Times Cited Count:0 Percentile:0(Physics, Applied)Yoshida, Masahiro; Ishii, Kenji; Ikeuchi, Kazuhiko*; Jarrige, I.; Murakami, Yoichi*; Mizuki, Junichiro; Tsutsui, Kenji; Toyama, Takami*; Maekawa, Sadamichi*; Kudo, Kazutaka*; et al.
Physica C, 470(Suppl.1), p.S145 - S146, 2010/12
Times Cited Count:4 Percentile:22.44(Physics, Applied)Jarrige, I.; Ishii, Kenji; Yoshida, Masahiro; Fukuda, Tatsuo; Ikeuchi, Kazuhiko*; Ishikado, Motoyuki*; Hiraoka, Nozomu*; Tsuei, K.-D.*; Kito, Hijiri*; Iyo, Akira*; et al.
Physica C, 470(Suppl.1), p.S377 - S378, 2010/10
Times Cited Count:4 Percentile:22.44(Physics, Applied)Hancock, J. N.*; Chabot-Couture, G.*; Li, Y.*; Petrakovski, G. A.*; Ishii, Kenji; Jarrige, I.; Mizuki, Junichiro; Devereaux, T. P.*; Greven, M.*
Physical Review B, 80(9), p.092509_1 - 092509_4, 2009/09
Times Cited Count:21 Percentile:64.66(Materials Science, Multidisciplinary)Jarrige, I.; Cai, Y. Q.*; Ishii, Hirofumi*; Hiraoka, Nozomu*; Bleuzen, A.*
Applied Physics Letters, 93(5), p.054101_1 - 054101_3, 2008/08
Times Cited Count:9 Percentile:37.11(Physics, Applied)