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Sekiguchi, Tetsuhiro; Yokoyama, Keiichi; Yaita, Tsuyoshi
Photon Factory Activity Report 2023 (Internet), 5 Pages, 2024/00
For nuclear transmutation of cesium-135 (Cs), which is long-lived fission product, we are developing selective absorbent which takes only Cs atom in, but does not CsI. In this study, absorbing property of Cs atom or CsI into fullerene (C
) solid has been investigated using synchrotron-based angle-dependent X-ray photoelectron spectroscopy (ARXPS). It was found that Cs penetrates into C
deep bulk. In contrast, CsI does not diffuse into bulk, although CsI over-layer was formed on the shallow surface. Furthermore, XPS spectra were measured as a function of Ar
-sputtering time in order to know Cs concentration profiles in further deep region. Results showed that Cs penetrates into deep region of several hundreds
.
Terasawa, Tomoo; Matsunaga, Kazuya*; Hayashi, Naoki*; Ito, Takahiro*; Tanaka, Shinichiro*; Yasuda, Satoshi; Asaoka, Hidehito
Vacuum and Surface Science, 66(9), p.525 - 530, 2023/09
As Au (001) surfaces exhibit a quasi-one-dimensional corrugated structure, Hex-Au(001), its periodicity was predicted to change the electronic structure of graphene when graphene was grown on this surface. Furthermore, the hybridization between graphene and Au is known to introduce bandgap and spin polarization into graphene. Here, we report angle-resolved photoemission spectroscopy and density functional theory calculation of graphene on a Hex-Au(001) surface. A bandgap of 0.2 eV in the graphene Dirac cone was observed at the crossing point of the graphene Dirac cone and Au 6sp bands, indicating that the origin of the bandgap formation was the hybridization between the graphene Dirac cone and Au 6sp band. We discussed the hybridization mechanism and anticipated spin injection into the graphene Dirac cone.
Terasawa, Tomoo; Matsunaga, Kazuya*; Hayashi, Naoki*; Ito, Takahiro*; Tanaka, Shinichiro*; Yasuda, Satoshi; Asaoka, Hidehito
Physical Review Materials (Internet), 7(1), p.014002_1 - 014002_10, 2023/01
Times Cited Count:7 Percentile:62.75(Materials Science, Multidisciplinary)Au(001) surfaces exhibit a complex reconstructed structure [Hex-Au(001)] comprising a hexagonal surface and square bulk lattices, yielding a quasi-one-dimensional corrugated surface. When graphene was grown on this surface, the periodicity of the corrugated surface was predicted to change the electronic structure of graphene, forming bandgaps and new Dirac points. Furthermore, the graphene-Au interface is promising for bandgap generation and spin injection due to band hybridization. Here, we report the angle-resolved photoemission spectroscopy and density functional calculation of graphene on a Hex-Au(001) surface. The crossing point of the original and replica graphene bands showed no bandgap, suggesting that the one-dimensional potential was too small to modify the electronic structure. A bandgap of 0.2 eV was observed at the crossing point of the graphene
and Au
bands, indicating that the bandgap is generated using hybridization of the graphene
and Au
bands. We discussed the hybridization mechanism and concluded that the R30 configuration between graphene and Au and an isolated electronic structure of Au are essential for effective hybridization between graphene and Au. We anticipate that hybridization between graphene
and Au
would result in spin injection into graphene.
Koga, Jun*; Takada, Shusuke*; Endo, Shunsuke; Fujioka, Hiroyuki*; Hirota, Katsuya*; Ishizaki, Kohei*; Kimura, Atsushi; Kitaguchi, Masaaki*; Niinomi, Yudai*; Okudaira, Takuya*; et al.
Physical Review C, 105(5), p.054615_1 - 054615_5, 2022/05
Times Cited Count:7 Percentile:72.81(Physics, Nuclear)no abstracts in English
Ideta, Shinichiro*; Johnston, S.*; Yoshida, Teppei*; Tanaka, Kiyohisa*; Mori, Michiyasu; Anzai, Hiroaki*; Ino, Akihiro*; Arita, Masashi*; Namatame, Hirofumi*; Taniguchi, Masaki*; et al.
Physical Review Letters, 127(21), p.217004_1 - 217004_6, 2021/11
Times Cited Count:13 Percentile:67.42(Physics, Multidisciplinary)Kirihara, Yoichi; Nakashima, Hiroshi; Sanami, Toshiya*; Namito, Yoshihito*; Itoga, Toshiro*; Miyamoto, Shuji*; Takemoto, Akinori*; Yamaguchi, Masashi*; Asano, Yoshihiro*
Journal of Nuclear Science and Technology, 57(4), p.444 - 456, 2020/04
Times Cited Count:9 Percentile:63.15(Nuclear Science & Technology)no abstracts in English
Nakatani, Yasuhiro*; Aratani, Hidekazu*; Fujiwara, Hidenori*; Mori, Takeo*; Tsuruta, Atsushi*; Tachibana, Shoichi*; Yamaguchi, Takashi*; Kiss, Takayuki*; Yamasaki, Atsushi*; Yasui, Akira*; et al.
Physical Review B, 97(11), p.115160_1 - 115160_7, 2018/03
Times Cited Count:5 Percentile:22.43(Materials Science, Multidisciplinary)Yamasaki, Atsushi*; Fujiwara, Hidenori*; Tachibana, Shoichi*; Iwasaki, Daisuke*; Higashino, Yuji*; Yoshimi, Chiaki*; Nakagawa, Koya*; Nakatani, Yasuhiro*; Yamagami, Kohei*; Aratani, Hidekazu*; et al.
Physical Review B, 94(11), p.115103_1 - 115103_10, 2016/11
Times Cited Count:18 Percentile:57.73(Materials Science, Multidisciplinary)In this study, we systematically investigate three-dimensional(3D) momentum-resolved electronic structures of Ruddlesden-Popper-type iridium oxides SrIr
O
using soft-X-ray angle-resolved photoemission spectroscopy (SX-ARPES). Our results provide direct evidence of an insulator-to-metal transition that occurs upon increasing the dimensionality of the IrO
-plane structure. This transition occurs when the spin-orbit-coupled
= 1/2 band changes its behavior in the dispersion relation and moves across the Fermi energy. By scanning the photon energy over 350 eV, we reveal the 3D Fermi surface in SrIrO
and
-dependent oscillations of photoelectron intensity in Sr
Ir
O
. To corroborate the physics deduced using low-energy ARPES studies, we propose to utilize SX-ARPES as a powerful complementary technique, as this method surveys more than one whole Brillouin zone and provides a panoramic view of electronic structures.
Urano, Hajime
JAERI-Research 2004-027, 131 Pages, 2005/02
no abstracts in English
Sakurai, Shinji; Tobita, Kenji; Nishio, Satoshi
Purazuma, Kaku Yugo Gakkai-Shi, 80(11), p.955 - 958, 2004/11
no abstracts in English
Fujimori, Shinichi; Okane, Tetsuo; Okamoto, Jun; Mamiya, Kazutoshi; Muramatsu, Yasuji; Fujimori, Atsushi*; Harima, Hisatomo*; Aoki, Dai*; Ikeda, Shugo*; Shishido, Hiroaki*; et al.
Physical Review B, 67(14), p.144507_1 - 144507_5, 2003/04
Times Cited Count:37 Percentile:80.37(Materials Science, Multidisciplinary)We have performed angle-resolved photoemission spectroscopy (~eV) and 3
-4
resonant photoemission spectroscopy (
~eV) studies on the layered cerium compounds Ce
In
(
=Rh and Ir), which show competition between superconductivity and antiferromagnetism. The results suggest that the Ce~4
electrons in both compounds are nearly localized. We have found that although the Ce~4
electrons in the superconducting CeIrIn
are more delocalized than those in the antiferromagnetic CeRhIn
, their electronic structures are very similar to each other.
Urano, Hajime*; Kamada, Yutaka; Shirai, Hiroshi; Takizuka, Tomonori; Kubo, Hirotaka; Takenaga, Hidenobu; Miura, Yukitoshi; Hatae, Takaki; Fukuda, Takeshi
Plasma Physics and Controlled Fusion, 44(5A), p.A437 - A443, 2002/05
Times Cited Count:18 Percentile:50.09(Physics, Fluids & Plasmas)no abstracts in English
Kamada, Yutaka; Takenaga, Hidenobu; Isayama, Akihiko; Hatae, Takaki; Urano, Hajime*; Kubo, Hirotaka; Takizuka, Tomonori; Miura, Yukitoshi
Plasma Physics and Controlled Fusion, 44(5A), p.A279 - A286, 2002/05
Times Cited Count:80 Percentile:89.44(Physics, Fluids & Plasmas)no abstracts in English
Fujita, Takaaki
Plasma Physics and Controlled Fusion, 44(5A), p.A19 - A35, 2002/05
Times Cited Count:28 Percentile:63.92(Physics, Fluids & Plasmas)no abstracts in English
Fujimori, Shinichi; Ino, Akihiro; Okane, Tetsuo; Fujimori, Atsushi; Okada, Kozo*; Manabe, Toshio*; Yamashita, Masahiro*; Kishida, Hideo*; Okamoto, Hiroshi*
Surface Review and Letters, 9(2), p.1065 - 1069, 2002/04
Times Cited Count:0 Percentile:0.00(Chemistry, Physical)no abstracts in English
Fujimori, Shinichi; Ino, Akihiro; Okane, Tetsuo; Fujimori, Atsushi; Harima, Hisatomo*; Aoki, Dai*; Ikeda, Shugo*; Shishido, Hiroaki*; Haga, Yoshinori; Tokiwa, Yoshifumi; et al.
Physica B; Condensed Matter, 312-313, p.132 - 133, 2002/03
Times Cited Count:1 Percentile:7.47(Physics, Condensed Matter)We have performed angle resolved photoemission experiments on heavy-fermion compounds CeRhIn and CeIrIn
. The obtained spectra are compared with the results of the full-potential linear-augmented-plane-wave (FLAPW) band-structure calculations, treating the Ce 4
electrons as being itinerant. The spectral contributions from the ligand Rh, Ir or In states were well reproduced by the calculations, although the features originated from Ce 4
states near
were not clearly observed.
Urano, Hajime*; Kamada, Yutaka; Shirai, Hiroshi; Takizuka, Tomonori; Kubo, Hirotaka; Hatae, Takaki; Fukuda, Takeshi
Plasma Physics and Controlled Fusion, 44(1), p.11 - 21, 2002/01
Times Cited Count:25 Percentile:60.17(Physics, Fluids & Plasmas)no abstracts in English
Moriyama, Shinichi; Ikeda, Yoshitaka; Kajiwara, Ken; Seki, Masami; Sakamoto, Keishi; Takahashi, Koji; Imai, Tsuyoshi; Fujii, Tsuneyuki; JT-60 Team
AIP Conference Proceedings 595, p.322 - 325, 2001/11
no abstracts in English
Sekiguchi, Tetsuhiro; Baba, Yuji
Hoshako, 13(2), p.29 - 37, 2000/04
no abstracts in English
Tsutsumi, Masahiro; Saito, Kimiaki; Moriuchi, Shigeru*
Journal of Nuclear Science and Technology, 37(3), p.300 - 306, 2000/03
no abstracts in English