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Journal Articles

Electronic structure of a (3$$times$$3)-ordered silicon layer on Al(111)

Sato, Yusuke*; Fukaya, Yuki; Cameau, M.*; Kundu, A. K.*; Shiga, Daisuke*; Yukawa, Ryu*; Horiba, Koji*; Chen, C.-H.*; Huang, A.*; Jeng, H.-T.*; et al.

Physical Review Materials (Internet), 4(6), p.064005_1 - 064005_6, 2020/06

 Times Cited Count:1 Percentile:32.54(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Mass transport in the PdCu phase structures during hydrogen adsorption and absorption studied by XPS under hydrogen atmosphere

Tang, J.*; Yamamoto, Susumu*; Koitaya, Takanori*; Yoshigoe, Akitaka; Tokunaga, Takuma*; Mukai, Kozo*; Matsuda, Iwao*; Yoshinobu, Jun*

Applied Surface Science, 480, p.419 - 426, 2019/06

 Times Cited Count:1 Percentile:74.19(Chemistry, Physical)

Mass transports during hydrogen adsorption and absorption processes of PdCu alloys that has advantages of higher hydrogen diffusivity and economically lower-cost than the other Pd-alloys were studied. The research was made with a comparison of the well-known ordered phase of the bcc structure (the B2 phase) and a mixed phase of the fcc and B2 structures. ${it In-situ}$ ultrahigh vacuum X-ray photoelectron spectroscopy and ambient pressure X-ray photoelectron spectroscopy using synchrotron radiation were carried out to trace the chemical states of the Pd and Cu atoms as a function of temperatures. It is elucidated that the initial adsorption and absorption processes were similar in the two phases, but a hydrogen diffusion rate to the bulk was higher in the ordered phase than in the mixed one. We found the dynamics of the Pd and Cu atoms during the hydrogen adsorption/absorption processes largely depend on temperature. In the hydrogen atmosphere, the Pd atoms segregate at the surface below 373 K and Cu atoms segregate at the surface above 373 K. The present results agree well with the previous theoretical calculations and, thus, provide appropriate inputs toward developments of the hydrogen permeation materials.

Journal Articles

Asymmetric atomic configuration of germanene, germanium atomic sheet

Fukaya, Yuki; Matsuda, Iwao*

Busseiken Dayori, 57(2), p.7 - 8, 2017/07

no abstracts in English

Journal Articles

Asymmetric structure of germanene on an Al(111) surface studied by total-reflection high-energy positron diffraction

Fukaya, Yuki; Matsuda, Iwao*; Feng, B.*; Mochizuki, Izumi*; Hyodo, Toshio*; Shamoto, Shinichi

2D Materials (Internet), 3(3), p.035019_1 - 035019_7, 2016/09

 Times Cited Count:28 Percentile:20.31(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Structure of silicene on a Ag(111) surface studied by reflection high-energy positron diffraction

Fukaya, Yuki; Mochizuki, Izumi*; Maekawa, Masaki; Wada, Ken*; Hyodo, Toshio*; Matsuda, Iwao*; Kawasuso, Atsuo

Physical Review B, 88(20), p.205413_1 - 205413_4, 2013/11

 Times Cited Count:54 Percentile:7.9(Materials Science, Multidisciplinary)

no abstracts in English

JAEA Reports

Construction of a car-borne survey system for measurement of dose rates in air; KURAMA-II, and its application

Tsuda, Shuichi; Yoshida, Tadayoshi; Nakahara, Yukio; Sato, Tetsuro; Seki, Akiyuki; Matsuda, Norihiro; Ando, Masaki; Takemiya, Hiroshi; Tanigaki, Minoru*; Takamiya, Koichi*; et al.

JAEA-Technology 2013-037, 54 Pages, 2013/10

JAEA-Technology-2013-037.pdf:4.94MB

JAEA has been performing dose rate mapping in air using a car-borne survey system KURAMA-II. The KURAMA system is a GPS-aided mobile radiation monitoring system that has been newly developed by Kyoto University Research Reactor Institute in response to the nuclear disaster. The KURAMA system is composed of an energy-compensated scintillation survey meter for measuring dose rate, electric device for controlling both the dose rates and the position data from a GPS module, a computer server for processing and analyzing data from KURAMA, and client PCs for providing for end users. The KURAMA-II has been improved in small-packaging, durability, and automated data transmission. In consequence, dose rate mapping in wide area has become possible in shorter period of time. This report describes the construction of KURAMA-II, its application and a suggestion of how to manage a large number of KURAMA-II.

Journal Articles

Structural analysis of Si(111)-$$sqrt{21}timessqrt{21}$$-(Ag, Cs) surface by reflection high-energy positron diffraction

Fukaya, Yuki; Matsuda, Iwao*; Yukawa, Ryu*; Kawasuso, Atsuo

Surface Science, 606(23-24), p.1918 - 1921, 2012/12

 Times Cited Count:2 Percentile:88.06(Chemistry, Physical)

no abstracts in English

Journal Articles

Atomic and electronic structures of Si(111)-$$sqrt{21}timessqrt{21}$$ superstructure

Fukaya, Yuki; Kubo, Keisuke*; Hirahara, Toru*; Yamazaki, Shiro*; Choi, W. H.*; Yeom, H. W.*; Kawasuso, Atsuo; Hasegawa, Shuji*; Matsuda, Iwao*

e-Journal of Surface Science and Nanotechnology (Internet), 10, p.310 - 314, 2012/07

no abstracts in English

Journal Articles

Atomic configuration and phase transition of Pt-induced nanowires on a Ge(001) surface studied using scanning tunneling microscopy, reflection high-energy positron diffraction, and angle-resolved photoemission spectroscopy

Mochizuki, Izumi; Fukaya, Yuki; Kawasuso, Atsuo; Yaji, Koichiro*; Harasawa, Ayumi*; Matsuda, Iwao*; Wada, Ken*; Hyodo, Toshio*

Physical Review B, 85(24), p.245438_1 - 245438_6, 2012/06

 Times Cited Count:17 Percentile:35.29(Materials Science, Multidisciplinary)

The atomic configuration and electronic band structure of Pt-induced nanowires on a Ge(001) surface are investigated using scanning tunneling microscopy, reflection high-energy positron diffraction, and angle-resolved photoemission spectroscopy. A previously proposed theoretical model, composed of Ge dimers on the top layer and buried Pt arrays in the second and fourth layers, is found to be the fundamental structure of the observed nanowires. At low temperatures ($$T$$ $$<$$ 80 K), each Ge dimer is alternately tilted in the surface normal direction (asymmetric), causing a p($$4times4$$) periodicity. At high temperatures ($$T$$ $$>$$ 110 K), each Ge dimer is flat with respect to the horizontal axis (symmetric), giving rise to p ($$4times2$$) periodicity. Upon the above phase transition, the electronic band dispersion related to the Ge dimers in the deeper energy region shifts to the Fermi level.

Journal Articles

Atomic structure of two-dimensional binary surface alloys; Si(111)-$$sqrt{21}timessqrt{21}$$ superstructure

Fukaya, Yuki; Matsuda, Iwao*; Hashimoto, Mie*; Kubo, Keisuke*; Hirahara, Toru*; Yamazaki, Shiro*; Choi, W. H.*; Yeom, H. W.*; Hasegawa, Shuji*; Kawasuso, Atsuo; et al.

Surface Science, 606(11-12), p.919 - 923, 2012/06

 Times Cited Count:6 Percentile:67.12(Chemistry, Physical)

no abstracts in English

Journal Articles

Surface structure of Si(111)-$$sqrt{21}timessqrt{21}$$-(Ag,Cs) studied by reflection high-energy positron diffraction

Fukaya, Yuki; Matsuda, Iwao*; Kawasuso, Atsuo; Ichimiya, Ayahiko*

JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 150, 2011/01

no abstracts in English

Journal Articles

Electron compound nature in a surface atomic layer of a two-dimensional hexagonal lattice

Matsuda, Iwao*; Nakamura, Fumitaka*; Kubo, Keisuke*; Hirahara, Toru*; Yamazaki, Shiro*; Choi, W. H.*; Yeom, H. W.*; Narita, Hisashi*; Fukaya, Yuki; Hashimoto, Mie*; et al.

Physical Review B, 82(16), p.165330_1 - 165330_6, 2010/10

 Times Cited Count:9 Percentile:55.18(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Metal co-adsorption induced $$sqrt{21}timessqrt{21}$$ superstructure on Si(111) surface studied by reflection high-energy positron diffraction

Fukaya, Yuki; Matsuda, Iwao*; Hashimoto, Mie; Narita, Hisashi*; Kawasuso, Atsuo; Ichimiya, Ayahiko

e-Journal of Surface Science and Nanotechnology (Internet), 7, p.432 - 435, 2009/04

no abstracts in English

Journal Articles

Atomic scale study of surface structures and phase transitions with reflection high-energy positron diffraction

Kawasuso, Atsuo; Fukaya, Yuki; Hashimoto, Mie; Ichimiya, Ayahiko; Narita, Hisashi*; Matsuda, Iwao*

Materials Science Forum, 607, p.94 - 98, 2008/11

Currently, we are performing the surface study with reflection high-energy positron diffraction (RHEPD). The advantage of this method is the appearance of total reflection of positrons at the first surface layer. In this talk, we will present the recent progress of our research on some unknown surface structures and phase transition mechanisms.

Oral presentation

Hume-Rothery-type electron compound formed in a single-atomic layer of metal alloy

Matsuda, Iwao*; Fukaya, Yuki; Hashimoto, Mie; Narita, Hisashi*; Kawasuso, Atsuo; Ichimiya, Ayahiko

no journal, , 

no abstracts in English

Oral presentation

Structural analysis of Si(111)-$$sqrt{21}timessqrt{21}$$-(Au,Ag) surface using reflection high-energy positron diffraction

Fukaya, Yuki; Matsuda, Iwao*; Hashimoto, Mie; Narita, Hisashi*; Kawasuso, Atsuo; Ichimiya, Ayahiko

no journal, , 

no abstracts in English

Oral presentation

Noble metal adsorption induced Si(111)-$$sqrt{21}timessqrt{21}$$ superstructure studied by reflection high-energy positron diffraction

Fukaya, Yuki; Matsuda, Iwao*; Hashimoto, Mie; Narita, Hisashi*; Kawasuso, Atsuo; Ichimiya, Ayahiko

no journal, , 

no abstracts in English

Oral presentation

Phase transition of Ag-Au coadsorbed Si(111) surfaces

Kido, Nozomi*; Ichimiya, Ayahiko; Matsuda, Iwao*; Fukaya, Yuki

no journal, , 

no abstracts in English

Oral presentation

Atomic height of Bi atom on Ag(111) thin film surface studied by reflection high-energy positron diffraction

Fukaya, Yuki; Matsuda, Iwao*; Mochizuki, Izumi; Kawasuso, Atsuo

no journal, , 

no abstracts in English

Oral presentation

Adsorption site of alkali metals on Si(111)-$$sqrt{3}timessqrt{3}$$-(Ag,Cs) surface studied by reflection high-energy positron diffraction

Fukaya, Yuki; Matsuda, Iwao*; Mochizuki, Izumi; Kawasuso, Atsuo

no journal, , 

no abstracts in English

34 (Records 1-20 displayed on this page)