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Journal Articles

Depth concentration profile for cesium atom in fullerene C $_{60}$ investigated using synchrotron X-ray photoelectron spectroscopy

Sekiguchi, Tetsuhiro; Yokoyama, Keiichi; Yaita, Tsuyoshi

Photon Factory Activity Report 2023 (Internet), 5 Pages, 2024/00

https://pfwww.kek.jp/acr/2023pdf/u_reports/pf23b0008.pdf

For nuclear transmutation of cesium-135 ( $^{135}$ 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 $_{60}$ ) solid has been investigated using synchrotron-based angle-dependent X-ray photoelectron spectroscopy (ARXPS). It was found that Cs penetrates into C $_{60}$ 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 .

Journal Articles

Band gap formation in graphene by hybridization with Hex-Au(001) reconstructed surface

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

https://doi.org/10.1380/vss.66.525

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.

Journal Articles

Band gap opening in graphene by hybridization with Au (001) reconstructed surfaces

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

https://doi.org/10.1103/PhysRevMaterials.7.014002

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.

Journal Articles

Angular distribution of rays from the -wave resonance of $^{118}$ Sn

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

https://doi.org/10.1103/PhysRevC.105.054615

Times Cited Count：7 Percentile：72.81(Physics, Nuclear)

no abstracts in English

Journal Articles

Hybridization of Bogoliubov quasiparticles between adjacent CuO layers in the triple-layer cuprate BiSrCaCuO $_{10+delta}$ studied by angle-resolved photoemission spectroscopy

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

https://doi.org/10.1103/PhysRevLett.127.217004

Times Cited Count：13 Percentile：67.42(Physics, Multidisciplinary)

Journal Articles

Neutron emission spectrum from gold excited with 16.6 MeV linearly polarized monoenergetic photons

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

https://doi.org/10.1080/00223131.2019.1691073

Times Cited Count：9 Percentile：63.15(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Evidence for momentum-dependent heavy fermionic electronic structures; Soft X-ray ARPES for the superconductor CeNi $_{2}$ Ge $_{2}$ in the normal state

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

AA2018-0003.pdf:1.65MB

https://doi.org/10.1103/PhysRevB.97.115160

Times Cited Count：5 Percentile：22.43(Materials Science, Multidisciplinary)

Journal Articles

Three-dimensional electronic structures and the metal-insulator transition in Ruddlesden-Popper iridates

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

AA2016-0587.pdf:2.55MB

https://doi.org/10.1103/PhysRevB.94.115103

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 Sr $_{n+1}$ Ir $_{n}$ O $_{3n+1}$ 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 $_{2}$ -plane structure. This transition occurs when the spin-orbit-coupled $j_{eff}$ = 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 $_{3}$ and $k_{z}$ -dependent oscillations of photoelectron intensity in Sr $_{3}$ Ir $_{2}$ O $_{7}$ . 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.

JAEA Reports

Energy confinement and transport of H-mode plasmas in tokamak

Urano, Hajime

JAERI-Research 2004-027, 131 Pages, 2005/02

JAERI-Research-2004-027.pdf:5.69MB

no abstracts in English

Journal Articles

Divertor power handling in a low aspect ratio tokamak reactor

Sakurai, Shinji; Tobita, Kenji; Nishio, Satoshi

Purazuma, Kaku Yugo Gakkai-Shi, 80(11), p.955 - 958, 2004/11

https://doi.org/10.1585/jspf.80.955

no abstracts in English

Journal Articles

Nearly localized nature of electrons in CeIn (=Rh, Ir)

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

https://doi.org/10.1103/PhysRevB.67.144507

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 CeIn (=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.

Journal Articles

Edge-core relationship of ELMy H-mode plasmas in JT-60U

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

https://doi.org/10.1088/0741-3335/44/5A/348

Times Cited Count：18 Percentile：50.09(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Pedestal characteristics and extended high- $beta_{p}$ ELMy H-mode regime in JT-60U

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

https://doi.org/10.1088/0741-3335/44/5A/328

Times Cited Count：80 Percentile：89.44(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Spatial structure of internal and edge transport barriers

Fujita, Takaaki

Plasma Physics and Controlled Fusion, 44(5A), p.A19 - A35, 2002/05

https://doi.org/10.1088/0741-3335/44/5A/302

Times Cited Count：28 Percentile：63.92(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Photoemission study of quasi-one-dimensional halogen-bridged compound [Ni(chxn) $_{2}$ Br]Br $_{2}$

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

https://doi.org/10.1142/S0218625X02003354

Times Cited Count：0 Percentile：0.00(Chemistry, Physical)

no abstracts in English

Journal Articles

Angle-resolved photoemission study of quasi-two-dimensional heavy-fermion compounds CeRhIn and CeIrIn

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

https://doi.org/10.1016/S0921-4526(01)01476-4

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 $E_{rm F}$ were not clearly observed.