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Publications
2023
Robustness of semimetallic transport properties of TaAs against off-stoichiometric disorder
A. Kawasuso, M. Suda, H. Murakawa, M. Komada,C. Suzuki, H. Amada, K. Michishio, M. Maekawa, A. Miyashita, N. Seko, S. Yamamoto, N. Oshima, S. Seki, and N. Hanasaki
J. Appl. Phys. 133(2023) 223903-1-6.
2022
High-density magnetic-vacancy inclusion in Co2MnGa single crystal probed by spin-polarized positron annihilation spectroscopy
A. Miyashita, M. Maekawa, Y. Shimoyama, N. Seko, A. Kawasuso, and R. Y. Umetsu
J. Phys.: Condens. Matter 34 (2022) 045701-1-9.
2021
Effect of disorder and vacancy defects on electrical transport properties of Co2MnGa thin films grown by magnetron sputtering
A. Miyashita, M. Maekawa, C. Suzuki, S. Yamamoto, A. Kawasuso, J. Wang, T. Seki, R. Y. Umetsu, and K. Takanashi
J. Appl. Phys. 130 (2021) 225301-1-7.
Positronium emission from GaN(0001) and AlN(0001) surfaces
A. Kawasuso, M. Maekawa, A. Miyashita, K. Wada, Y. Nagashima, and A. Ishida
J. Phys. B: At. Mol. Opt. Phys. 54 (2021) 205202-1-6.
Spin-Polarized Positronium Time-of-Flight Spectroscopy for Probing Spin-Polarized Surface Electronic States
M. Maekawa, A. Miyashita, S. Sakai, S. Li, S. Entani, and A. Kawasuso
Phys. Rev. Lett. 126 (2021) 186401-1-6.
Positronium formation at 4H SiC(0001) surfaces
A. Kawasuso, K. Wada, A. Miyashita, M. Maekawa, H. Iwamori, S. Iida, and Y. Nagashima
J. Phys. Condens. Matter. 33 (2021) 035006-1-7.
2020
Development a new positron source for spin-polarized positron beam generation
M. Maekawa, K. Wada, and A. Kawasuso
Nucl. Inst. Meth. Phys. Res. B 480 (2020) 49-55.
Gadolinium-implanted GaN studied by spin-polarized positron annihilation spectroscopy
M. Maekawa, A. Miyashita, S. Sakai, and A. Kawasuso
Phys. Rev. B 102 (2020) 054427-1-8.
Spin polarization of graphene on Co2FeGe0.5Ga0.5(001) observed by spin-polarized surface positronium spectroscopy
A. Miyashita, S. Li, S. Sakai, M. Maekawa, and A. Kawasuso
Phys. Rev. B 102 (2020) 045425-1-4.
A pulse stretcher for a LINAC-based pulsed slow-positron beam providing a quasi-continuous beam with an energy of 5.2 keV
K. Wada, M. Maekawa, I. Mochizuki, T. Shidara, A. Kawasuso, M. Kimura, and T. Hyodo
Nucl. Inst. Meth. Phys. Res. A 975 (2020) 164161.
2018
Total-reflection high-energy positron diffraction (TRHEPD) for structure determination of the topmost and immediate sub-surface atomic layers
Y. Fukaya, A. Kawasuso, A. Ichimiya, and T. Hyodo
J. Phys. D: Appl. Phys. 52 (2019) 013002-1-19.
Spin-Polarized Positron Annihilation Measurement on Ga Vacancies in p-type GaN
M. Maekawa, S. Sakai, A. Miyashita, A. Kawasuso
e-J. Surf. Sci. Nanotech. 16 (2018) 347-350.
Observation of low-energy positron diffraction patterns with a linac-based slow-positron beam
K. Wada, T. Shirasawa, I. Mochizuki, M. Fujinami, M. Maekawa, A. Kawasuso, T. Takahashi, T. Hyodo
e-J. Surf. Sci. Nanotech. 16 (2018) 313-319.
Positronium formation at Si surfaces
A. Kawasuso, M. Maekawa, A. Miyashita, K. Wada, T. Kaiwa, Y. Nagashima
Phys. Rev. B 97 (2018) 245303-1-8.
Spin polarization of graphene and h-BN on Co(0001) and Ni(111) observed by spin-polarized surface positronium spectroscopy
A. Miyashita, M. Maekawa, K. Wada, A. Kawasuso, T. Watanabe, S. Entani, and S. Sakai
Phys. Rev. B 97 (2018) 195405-1-5.
2017
Vacancy-induced ferromagnetism in ZnO probed by spin-polarized positron annihilation spectroscopy
Masaki Maekawa, Hiroshi Abe, Atsumi Miyashita, Seiji Sakai, Shunya Yamamoto, and Atsuo Kawasuso
Appl. Phys. Lett. 110 (2017) 172402-1-5.
Vacancy-mediated ferromagnetism in Co-implanted ZnO studied using a slow positron beam
D. D. Wnag, B. Zhao, N. Qi, Z. Q. Chen and A. Kawasuso
J. Mater. Sci. 52 (2017) 7067-7076.
Spin-Polarized Positron Annihilation Study on Some Ferromagnets
H. Li, M. Maekawa, A. Miyashita, A. Kawasuso
Defect and Diffusion Forum 373 (2017) 65-70.
Construction of a surface positronium lifetime spectroscopy apparatus with a spin-polarized low energy positron beam
M. Maekawa, K. Wada, A. Miyashita and A. Kawasuso
J. Phys. Conf. Ser. 791 (2017) 021009.
Research progress at the Slow Positron Facility in the Institute of Materials Structure Science, KEK
T. Hyodo, K. Wada, I. Mochizuki, M. Kimura, N. Toge, T. Shidara, Y. Fukaya, M. Maekawa, A. Kawasuso, S. Iida, K. Michishio, and Y. Nagashima
J. Phys.: Conf. Ser. 791 (2017) 012003.
2016
Structure determination of the rutile-TiO2(110)-(1x2) surface using total-reflection high-energy positron diffraction (TRHEPD)
I. Mochizuki, H. Ariga, Y. Fukaya, K. Wada, M. Maekawa, A. Kawasuso, T. Shidara, K. Asakura and T. Hyodo
Phys.Chem.Chem.Phys. 18（2016) 7085-7092.
2015
Structure determination of the rutile-TiO2(110)-(1x2) surface using total-reflection high-energy positron diffraction (TRHEPD)
I. Mochizuki, H. Ariga, Y. Fukaya, K. Wada, M. Maekawa, A. Kawasuso, T. Shidara, K. Asakura and T. Hyodo
Phys. Chem. Chem. Phys. 18（2016) 7085-7092.
Effect of magnetic field on positronlifetimes of Fe, Co and Ni
H. Li, M. Maekawa, A. Kawasuso and N. Tanimura
J. Phys. Condens. Matter 27 (2015) 246001-1-5.
Charge-to-spin conversion and spin diffusion in Bi/Ag bilayers observed by spin-polarized positron beam
H. J. Zhang, S. Yamamoto, B. Gu, H. Li, M. Maekawa, Y. Fukaya, and A. Kawasuso
Phys. Rev. Lett. 114 (2015) 166602-1-5.
Enhanced damage buildup in C+-implanted GaN film studied by a monoenergetic positron beam
X. F. Li, Z. Q. Chen, C. Liu, H. J. Zhang, and A. Kawasuso
J. Appl. Phys. 117 (2015) 085706-1-5.
2014
Defects and acceptor centers in ZnO introduced by C+-implantation
M. Jiang, X. D. Xue, Z. Q. Chen, Y. D. Liu, H. W. Liang, H. J. Zhang, A. Kawasuso
J. Mater. Sci. 49 (2014) 1994-1999.
Doppler-Broadening of Annihilation Radiation Spectroscopy under High Magnetic Field Using a Longitudinally Spin-polarized Slow Positron Beam
M. Maekawa, H. Zhang, H. Li,Y. Fukaya, A. Kawasuso
Jpn. J. Appl. Phys. Conf. Proc. 2 (2014) 011305-1-7.
Brightness enhancement of a linac-based intense positron beam for RHEPD
M. Maekawa, Y. Fukaya, A. Kawasuso, K. Wada, T. Hyodo
Eur. Phys. J. D 68 (2014) 165(6).
Total reflection high-energy positron diffraction (TRHEPD)
T. Hyodo, Y. Fukaya, M. Maekawa, I. Mochizuki, K. Wada, T. Shidara, A. Ichimiya and A. Kawasuso
J. Phys. Conf. Ser. 505 (2014) 012001(6).
Spin polarizations of positron beams generated using electrostatic and magnetic transportation systems with 68Ge and 22Na sources
M. Maekawa, Y. Fukaya, H. Zhang, H. Li and A. Kawasuso
J. Phys. Conf. Ser. 505 (2014) 012033(4).
Reflection high-energy positron diffraction study on the first surface layer
Y. Fukaya, M. Maekawa, I. Mochizuki, K Wada, T. Hyodo and A. Kawasuso
J. Phys. Conf. Ser. 505 (2014) 012005(6).
Current-induced spin polarization on metal surfaces probed by spin-polarized positron beam
H. J. Zhang, S. Yamamoto, Y. Fukaya, M. Maekawa, H. Li, A. Kawasuso, T. Seki, E. Saitoh& K. Takanashi
Scientific Reports 4 (2014) doi:10.1038/srep04844.
Total reflection high-energy positron diffraction: An ideal diffraction technique for surface analysis
Y. Fukaya, M. Maekawa, A. Kawasuso, I. Mochizuki, K. Wada, T. shidara, A. Ichimiya and T. Hyodo
Appl. Phys. Exp. 7 (2014) 056601-1-4.
2013
Structure of silicene on Ag(111) surface studied by reflection high-energy positron diffraction
Y. Fukaya, I. Mochizuki, M. Maekawa, K. Wada, T. Hyodo, I. Matsuda and A. Kawasuso
Phys. Rev. B 88 (2013) 205413-1-4.
Positron annihilation Doppler broadening study of Xe-implanted aluminum
R.S. Yu,., M. Maekawa, A. Kawasuso, B.Y. Wang, L. Wei
Appl. Surf. Sci. 282 (2013) 724.
New experiment stations at KEK Slow Positron Facility
K Wada, T Hyodo, T Kosuge, Y Saito, M Ikeda, S Ohsawa, T Shidara, K Michishio, T Tachibana, H Terabe, R H Suzuki, Y Nagashima, Y Fukaya, M Maekawa, I Mochizuki and A Kawasuso
J. Phys. Conf. Ser. 443 (2013) 012082(6).
Observation of spatial distribution of vacancy defects in semiconductor by positron microscope and electron beam induced current measurement
M Maekawa and A Kawasuso
J. Phys. Conf. Ser. 443 (2013) 012041(4).
Reflection high-energy positron diffraction: the past 15 years and the future
Y Fukaya, M Maekawa, I Mochizuki, K Wada, T Hyodo and A Kawasuso
J. Phys. Conf. Ser. 443 (2013) 012068(6).
Spin-polarized positron annihilation spectroscopy for spintronics applications
A. Kawasuso, Y. Fukaya, M. Maekawa, I. Mohizuki, and H. Zhang
J. Phys. Conf. Ser. 443 (2013) 012084(4).
Current-induced spin polarization on a Pt tsurface : A new approach using spin-polarized positron annihilation spectroscopy
A. Kawasuso, Y. Fukaya, M. Maekawa, H. Zhang, T. Seki, T.Yoshino, E. Saitoh, K. Takanashi
J. Mag. Mag. Mater. 342 (2013) 139-143.
Development of spin-polarized slow positron beam using a 68Ge-68Ga positron source
M. Maekawa, Y. Fukaya, A. Yabuuchi, I. Mochizuki, A. Kawasuso
Nucl. Inst. Meth. Phys. Res. B 308 (2013) 9-14.
Suppression of vacancy aggregation by silicon-doping in low-temperature-grown GaCrN
A. Yabuuchi, M. Maekawa, A. Kawasuso, Y.-K. Zhou, S. Hasegawa, and H. Asahi
Appl. Phys. Lett. 102 (2013）142406(4 pages).
Location and size of nanoscale free-volume holes in crosslinked-polytetrafluoroethylene-based graft-type polymer electrolyte membranes determined by positron annihilation lifetime spectroscopy
S. Sawada, A. Yabuuchi, M. Maekawa, A. Kawasuso, Y. Maekawa
Rad. Phys. Chem. 87 (2013) 46-52.
Atomic and Electronic Structures of Si(111)-√21×√21 Superstructure
Y. Fukaya, K. Kubo, T. Hirahara, S. Yamazaki, W. H. Choi, H. W. Yeom, A. Kawasuso, S. Hasegawa, I. Matsuda
e-JSSN 10 (2012) 310.
2012
Study of defects in H+ ion implanted B2 type Fe-Al alloy using slow positron beam
S. Komagata, A. Kawasuso, A. Yabuuchi, M. Maekawa, C. Batchulun, K. Yasuda, R. Ishigami, K. Kume, A. Iwase and F. Hori
Physics Procedia 35 (2012) 75-79.
Structural analysis of Si(111)-√21×√21-(Ag,Cs) surface by reflection high-energy positron diffraction
Y. Fukaya, I. Matsuda, R. Yukawa and A. Kawasuso
Surf. Sci. 606 (2012) 1918-1921.
Influence of oversized elements (Hf, Zr, Ti and Nb) on the thermal stability of vacancies in type 316L stainless steels
A. Yabuuchi, M. Maekawa, A. Kawasuso
J. Nucl. Mater. 430 (2012) 190-193.
Charge transfer and structure of K/Si(111)-2√3×2√3-B surface studied by reflection high-energy positron diffraction
Y. Fukaya, I. Mochizuki and A. Kawasuso
Phys. Rev. B 86 (2012) 035423-1-5.
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
I. Michizuki, Y. Fukaya, A. Kawasuso, K. Yaji, A. Harasawa, I. Matsuda, K. Wada and T. Hyodo
Phys. Rev. B 85 (2012) 245438-1-6.
Atomic structure of two-dimensional binary surface alloys: Si(111)-√21×√21 superstructure
Y. Fukaya, I. Matsuda, M. Hashimotom K. Kubo, T. Hirahara, W. H. Choi, H. W. Yeom, S. Hasegawa, A. Kawasuso, A. Ichimiya
Surf. Sci. 606 (2012) 919-923.
Increase in the beam intensity of the linac-based slow positron beam and its application at the Slow Positron Facility, KEK
K. Wada, T. Hyodo, A. Yagishita, M. Ikeda, S. Ohsawa, T. Shidara, K. Michishio, T. Tachibana, Y. Nagashima, Y. Fukaya, M. Maekawa, A. Kawasuso
Eur. Phys. J. D 66 (2012) 37(4).
Doppler broadening of annihilation radiation measurements on 3d and 4f ferromagnets using polarized positrons
A. Kawasuso, M. Maekawa, Y. Fukaya, A. Yabuuchi and I. Mochizuki
Phys. Rev. B 85 (2012) 024417(6).
Positron annihilation study of 4H-SiC by Ge implanted and subsequent thermal annealing
R. S. Yu, M. Maekawa, A. Kawasuso, B. Y. Wang and L. Wei
Nucl. Inst. Meth. in Phys. Res. B 270 (2012) 47-49.
Development of pulsed positron beam line with compact pulsing system
M. Maekawa and A. Kawasuso
Nucl. Inst. Meth. in Phys. Res. B 270 (2012) 23-27.
2011
Microstructure of Nearly Stoichiometric ZrC Coating Layers for Advanced High Temperature Gas Cooled Reactor Fuel and Positron Annihilation Spectroscopy of Various ZrC coating layers
J. Aihara, M. Maekawa, S. Ueta, A. Kawasuso and K. Sawa
J. Am. Ceram. Soc. 94 (2011) 4516-4522.
Vacancy defects in a stress-corrosion-cracked Type 304 stainless steel investigated by positron annihilation spectroscopy
A. Yabuuchi, M. Maekawa, A. Kawasuso
J. Nucl. Matt. 419 (2011) 9-14.
Spin-polarized positron annihilation measurements on polycrystalline Fe, Co, Ni and Gd based on Doppler broadening of annihilation radiation
A. Kawasuso, M. Maekawa, Y. Fukaya. A. Yabuuchi and I. Mochizuki
Phys. Rev. B 83 (2011) 100406(R).
Defect Structure of MBE-grown GaCrN Diluted Magnetic Semiconductor Film
A. Yabuuchi, M. Maekawa, A. Kawasuso, S. Hasegawa,, Yi-Kai Zhou and H. Asahi
J. Phys. Conf. Ser. 262 (2011) 012066.
Positron Microbeam Study on Vacancy Generation Caused by Stress Corrosion Crack Propagation in Austenitic Stainless Steels
A. Yabuuchi, M. Maekwa and A. Kawasuso
J. Phys. Conf. Ser. 262 (2011) 012067.
Development of spinpolarized positron beam using high energy proton beam
M. Maekawa, A. Kawasuso, Y. Fukaya, A. Yabuuchi
J. Phys. Conf. Ser. 262 (2011) 012035.
A study of defects in electron- and ion-irradiated ZrCuAl bulk glassy alloy using positron annihilation techniques
F. Hori, N. Onodera, Y. Fukumoto, A. Ishii, A. Iwase, A. Kawasuso, A. Yabuuchi, M. Maekawa and Y. Yokoyama
J. Phys. Conf. Ser. 262 (2011) 012025.
2010
Electron compound nature in a surface atomic layer of a two-dimensional hexagonal lattice
Iwao Matsuda, F. Nakamura, K.Kubo, T. Hirahara, S. Yamazaki, W. H. Choi, H. W. Yeom, H. Narita, Y. Fukaya, M. Hashimoto, A. Kawasuso, M. Ono, Y. Hasegawa, S. Hasegawa, and K. Kobayashi
Phys. Rev. B 82 (2010) 165330-1-6.
Spin conversion of positronium in NiO/Al2O3 catalysts observed by coincidence Doppler broadening technique
H.J. Zhang, Z. Q. Chen, S. J. Wang, A. Kawasuso and N. Morishita
Phys. Rev. B 82 (2010) 035439-10.
Free volume in Zr-based bulk glassy alloys studied by positron annihilation techniques
A Ishii, A. Iwase Y. Yokoyama, T. J. Konno, A. Kawasuso, A Yabuuchi, M.Maekawa, and F. Hori
J. Phys. Conf. Ser. 225 (2010) 012020.
Surface plasmon excitation at metal surfaces studied by reflection high-energy positron diffraction
Y. Fukaya, A. Kawasuso and A. Ichimiya
J. Phys. Conf. Ser. 225 (2010) 012009.
Structure and phase transition of low-dimensional metals on crystal surface studied by reflection high-energy positron difraction
Y. Fukaya, M. Hashimoto, A. Kawasuso, A. Ichimiya
J. Phys. Conf. Ser. 225 (2010) 012008.
Free-volume structure of fluoropolymer-based radiationgrafted electrolyte membranes investigated by positron annihilation lifetime spectroscopy
S. Sawada, A. Kawasuso, M. Maekawa, A. Yabuuchi, Y. Maekawa
J. Phys. Conf. Ser. 225 (2010) 012048.
Development of Spin-Polarized Positron Beam
A. Kawasuso, Y. Fukaya, M. Maekawa and A. Yabu-uchi
J. Phys. Conf. Ser. 225 (2010) 012028.
Coincidence Doppler broadening spectra of some single-element materials from the second to the sixth periods
A. Kawasuso, M. Maekawa and K. Betsuyaku
J. Phys. Conf. Ser. 225 (2010) 012027.
Characterization of the Helium Bubbles in Si Probed by a Slow Positron Beam
M. Maekawa, A. Kawasuso
J. Phys. Conf. Ser. 225 (2010) 012032.
Evaluation of stainless steel under tensile stress using positron microbeam
M. Maekawa, A. Yabuuchi, A. Kawasuso
J. Phys. Conf. Ser. 225 (2010) 012033.
Surface plasmon excitation at topmost surface in reflection high-energy positron diffraction
Y. Fukaya, A. Kawasuso and A. Ichimiya
e-J. Surf. Sci. Nanotech. 8 (2010) 190-193.
2009
TiCrV hydrogen storage alloy studied by positron annihilation spectroscopy
A. Kawasuso, H. Arashima, M. Maekawa, H. Itoh, and T. Kabutomori
J. Alloy Compd. 486 (2009) 278-283.
Microstructure evolution of Ge+ implanted silicon oxide thin films upon annealing treatment
R.S.Yu, M. Maekawa, A. Kawasuso. T. Sekiguchi, B.Y.Wang, X.B.Qin, Q. Z. Wang
Nucl. Inst. & Meth. In Phys. Res. B 267 (2009) 3097-3099.
Ferromagnetism and microstructure in Fe+-implanted ZnO
D. Wanga, Z.Q. Chen, F. Zhou, W. Lub, M. Maekawa, A. Kawasuso
Appl. Surf. Sci. 255 (2009) 9371-9375.
Phase transition of In/Si(111) surface studied by reflection high-energy positron diffraction
M. Hashimoto, Y.Fukaya, A. Kawasuso and A. Ichimiya
e-J. Surf. Sci. Nanotech. 7 (2009) 436-440.
Metal co-adsorption induced √21×√21 superstructure on Si(111) surface studied by reflection high-energy positron diffraction
Y. Fukaya, I. Matsuda, M. Hashimoto, H. Narita, A. Kawasuso and A. Ichimiya
e-J. Surf. Sci. Nanotech. 7 (2009) 432-435.
Inelastic scattering processes in reflection high-energy positron diffraction from a Si(111)-7×7 surface
Y. Fukaya, A. Kawasuso and A. Ichimiya
Phys. Rev. B 79 (2009) 193310-1-4.
Recent findings on blistering and deuterium retention in tungsten exposed to high-fluence deuterium plasma
W.M. Shu, A. Kawasuso and T. Yamanishi
J. Nucl. Matter. 386-388 (2009) 356-359.
Vacancy Generation in Si During Solid-Liquid Transition Observed by Positron Annihilation Spectroscopy
M. Maekawa, A. Kawasuso
Jpn. J. Appl. Phys. 48 (2009) 030203-030205.
Application of positron microprobe for nuclear materials
M. Maekawa, A. Kawasuso, T. Hirade, Y. Miwa and A. Nishimura,
Mater. Sci. For. 607 (2009) 266-268.
Positron annihilation lifetime study of electrolyte membranes
S. Sawada, A. Kawasuso, M. Maekawa, A. Suzuki, T. Terai and Y. Maekawa
Mater. Sci. For. 607 (2009) 70-72.
Positron Lifetime Study on Degradation of TiCrV Hydrogen Storage Alloy
A. Kawasuso, H. Arashima, M. Maekawa and T. Kabutomori
Mater. Sci. For. 607 (2009) 122-124.
Atomic Scale Study of Surface Structures and Phase Transition with Reflection High-Energy Positron Diffraction
A. Kawasuso,Y. Fukaya, M. Hashimoto, A. Ichimiya, H. Narita and I Matsuda
Mater. Sci. For. 607 (2009) 94-98.
2008
Spin polarization of an electrostatic positron beam
A. Kawasuso and M. Maekawa
Appl. Surf. Sci. 255 (2008) 108-110.
Construction of a positron micro-beam in JAEA
M.Maekawa and A. Kawasuso
Appl. Surf. Sci. 255 (2008) 39-41.
Quasi-one-dimensional In atomic chains on Si(111) surface at low temperature studied by reflection high energy positron diffraction
M. Hashimoto, Y.Fukaya, A. Kawasuso and A. Ichimiya
Appl. Surf. Sci. 254 (2008) 7733-7736.
Surface structure and phase transition of Ge(111)-3×3-Pb studied by reflection high-energy positron diffraction
Y. Fukaya, M. Hashimoto, A. Kawasuso and A. Ichimiya
Appl. Surf. Sci. 254 (2008) 7827-7830.
Surface structure of Si(111)-8×2-In studied by reflection high-energy positron diffraction
Y. Fukaya, M. Hashimoto, A. Kawasuso and A. Ichimiya
Sur. Sci. 602 (2008) 2448-2458.
Development and application of positron microbeam
M. Maekawa, A. Kawasuso, T. Hirade and Y. Miwa
Trans. Matter Res. Soc. Jpn. 33 (2008) 287-290.
Vacancy defects in electron-irradiated ZnO studied by Doppler broadening of annihilation radiation
Z.Q.Chen, K. Betsuyaku and A. Kawasuso
Phys. Rev. B 77 (2008) 113204-113207.
2007
Characterization of swift-ion induced defects in FeRh alloy by using positron beam technique
N. Hori, M. Fukuzumi, A. Kawasuso, Y. Chimi, N. Ishikawa and A. Iwase
Phys. Stat. Sol. (c) 4 (2007) 3530-3533.
Ion species dependence of the implantation-induced defects in ZnO studied by a slow positron beam
Z. Q. Chen, M. Maekawa, A. Kawasuso, H. Naramoto
Phys. Stat. Sol. (c) 4 (2007) 3646-3649.
Positron microscopic analysis of crack failure in stainless steels
R. Yu, M. Maekawa, Y. Miwa, T. Hirade, A. Nishimura and A. Kawasuso
Phys. Stat. Sol. (c) 4 (2007) 3577-3580.
Design of a positron microbeam using magnetic lenses
M. Maekawa, R. Yu and A. Kawasuso
Phys. Stat. Sol. (c) 4 (2007) 4016-4019.
Characterization of ion beam-induced SiC-OI structures probed by positron annihilation spectroscopy
M. Maekawa, R. Yu and A. Kawasuso
Phys. Stat. Sol. (c) 4 (2007) 3680-3683.
Reflection high-energy positron diffraction study of surface super structures
A. Kawasuso, Y. Fukaya, M. Hashimoto and A. Ichimiya
Phys. Stat. Sol.(c) 4 (2007) 3924-3927.
Thermal evolution of defects in as-grown and electron-irradiated ZnO studied by positron annihilation
Z. Q. Chen, S. J. Wang, M. Maekawa, A. Kawasuso, H. Naramoto, X. L. Yuan, and T. Sekiguchi
Phys. Rev. B 75 (2007) 245206-245214.
Surface Structure of In/Si(111) studied by reflection high-energy positron diffraction
M. Hashimoto, Y.Fukaya, A. Kawasuso and A. Ichimiya
Surf. Sci. 601 (2007) 5192-5194.
Strutural analysis of Si(111)-√21×21-(Ag,Au) surface by using reflection high-energy positron diffraction
Y.Fukaya, A. Kawasuso and A. Ichimiya
Surf. Sci. 601 (2007) 5187-5191.
Reflection high-energy positron diffraction study on Si(111)-√3×√3-Ag surface
Y. Fukaya, A. Kawasuso and A. Ichimiya
Phys. Rev. B 75 (2007) 115474-1-6.
Microstructure dependence of deuterium retention and blistering in the near-surface region of tungsten exposed to high flux deuterium plasmas of tens of 38eV
W. M. Shu, A. Kawasuso, Y. Miwa, E. Wakai, G.-N. Luo, d and T. Yamanishi
Physica Scipta T 128 (2007) 96-99.
2006
Vacancy-type defects induced by He-implantation in ZnO studied by a slow positron beam
Z. Q. Chen, A. Kawasuso
Acta Phys. Sin. 55 (2006) 4353-4354.
Reflection high-energy positron diffraction pattern from a Si(111)-7×7 surface
K. Hayashi, A. Kawasuso and A. Ichimiya
Surf. Sci. 600 (2006) 4426-4429.
Structural analysis of Si(111)-√21×√21-Ag surface by reflection high-energy positron diffraction
Y. Fukaya, A. Kawasuso and A. Ichimiya
Surf. Sci. 600 (2006) 3141-3146.
Structural analysis of Ge(111)-3×3-Sn surface at low-temperature by reflection high-energy positron diffraction
Y. Fukaya, A. Kawasuso and A. Ichimiya
Surf. Sci. 600 (2006) 4086-4088.
Annealing process of ion-implantation-induced defects in ZnO: Chemical effect of the ion species
Z. Q. Chen, M. Maekawa, A. Kawasuso, S. Sakai, and H. Naramoto
J. Appl. Phys. 99 (2006) 93507-93511.
Adsorption of oxygen on Si(001) surfaces studied by reflection high-energy positron diffraction
K. Hayashi, A. Kawasuso and A. Ichimiya
e-J. Surf. Sci. Nanotech. 4 (2006) 510-513.
Order-disorder phase transition and structure of Sn/Ge(111) surface studied by reflection high-energy positron diffraction
Y. Fukaya, A. Kawasuso and A. Ichimiya
e-J. Surf. Sci. Nanotech. 4 (2006) 435-438.
Defects in electron irradiated ZnO studied by positron annihilation
Z.Q. Chen, M. Maekawa, A. Kawasuso, S.Sakai, H.Naramoto
Physica B: Condensed Matter 376-377 (2006) 722-725.
Defect Layer in SiO2/SiC Interface Proved by a Slow Positron Beam
M. Maekawa, A. Kawasuso, M. Yoshikawa, A. Miyashita, R. Suzuki and T. Ohdaira
Physica B: Condensed Matter 376-377 (2006) 350-353.
Positron study of vacancy defects in SiC
A. Kawasuso, M Yoshikawa, H. Itoh, R. Krause-Rehberg, F. Redmann, T. Chiba, T. Higuchi and K. Betsuyaku
Physica B: Condensed Matter 376-377 (2006) 354-357.
Energy variable slow positron beam study of Li+ implantation induced defects in ZnO
Z.Q.Chen, M. Maekawa and A. Kawasuso
Chi. Phys. Lett. 23 (2006) 675-677.
Structure of SiO2/4H-SiC interface probed by positron annihilation spectroscopy
M. Maekawa, A. Kawasuso, M. Yoshikawa, A.Miyashita,R.Suzuki, and T.Ohdaira
Phys. Rev. B 73 (2006) 14111-14120.
2005
Positron Lifetime Measurement on centrifuged Bi3Pb7 Intermetallic compound
M. Ono, X. Huang, Y. Shibata, Y. Iguchi, S. Sakai, M. Maekawa, Z. Q. Chen, T. Osakabe, A. Kawasuso, H. Naramoto and T. Mashimo
Proc. the 1st Int. Conf. on Diffusion in Solids and Liquids “DSL-2005”, 2 (2005) 531-534.
Interaction of nitrogen with vacancy defects in N+-implanted ZnO studied using a slow positron beam
Z.Q. Chen, M. Maekawa, S. Yamamoto, A.Kawasuso, R. Suzuki and T. Ohdaira
Appl. Phys. Lett. 87 (2005) 91910-91912.
Order-disorder phase transition of Si(111)-√3x√3-Ag surface studied by reflection high-energy positron diffraction
Y. Fukaya, A. Kawasuso and A. Ichimiya
e-J. Surf. Sci. Nanotech. 3 (2005) 228-232.
Electron-positron momentum distributions associated with isolated silicon vacancies in 3C SiC
A. Kawasuso, M. Yoshikawa, H. Itoh, T. Chiba, T. Higuchi, F. Redmann and R. Krause-Rehberg
Phys. Rev. B 72 (2005) 45204-45209.
Angular correlation of annihilation radiation associated with vacancy defects in electron-irradiated 6H SiC
A. Kawasuso, T. Chiba and T. Higuchi
Phys. Rev. B 71 (2005) 193204-193207.
Hydrogen implantation induced microvoid formation in ZnO probed by a slow positron beam
Z. Q. Chen, A. Kawasuso, Y. Xu, H. Naramoto, X. L. Yuan, T. Sekiguchi, R. Suzuki and T. Ohdaira
Phys. Rev. B 71 (2005) 115213-115220.
Polymetric Co-C60 compund phase evoluted in atmistically mixed thin films
S. Sakai, H. Naramoto, V.Lavrentiev, K. Narumi, M. Maekawa, A. Kawasuso, T. Yaita and Y. Baba
Materials Transcations 46（2005）765-768.
Structural defects in SiO2/SiC interface probed by a slow positron beam
M. Maekawa, A. Kawasuso, M. Yoshikawa and A. Ichimiya
Appl. Surf. Sci. 244 (2005) 322-325.
Characterization of homoepitaxial and heteroepitaxial ZnO films grown by pulsed laser deposition
Z. Q. Chen, S.Yamamoto, A. Kawasuso, A. Ichimiya, Y.Xu, T. Sekiguchi
Appl. Surf. Sci. 244 (2005) 377-380.
Observation of Si(111)-√3×√3-Ag surface at room temperature studied by reflection high-energy positron diffraction
Y. Fukaya, A. Kawasuso, K. Hayashi and A. Ichimiya
Appl. Surf. Sci. 244 (2005) 166-169.
Reflection high energy positron diffraction study of a Si(001) surface
K. Hayashi, Y. Fukaya, A. Kawasuso and A. Ichimiya
Appl. Surf. Sci. 244 (2005) 145-148.
Positron diffraction study of SiC(0001) surface
A. Kawasuso, M. Maekawa, M. Yoshikawa and A. Ichimiya
Appl. Surf. Sci. 244 (2005) 149-152.
Production and recovery of defects in P+-implanted ZnO studied by positron annihilation, Raman scattering, and cathodoluminescence measurements
Z. Q. Chen, Y. Xu, A. Kawasuso, X. L. Yuan, T. Sekiguchi, R. Suzuki and T. Ohdaira
J. Appl. Phys. 97 (2005) 13528-13533.
2004
Dynamics of adatoms of Si(111)-(7x7) surface studied by reflection high-energy positron diffraction
Y. Fukaya, A. Kawasuso, K. Hayashi and A. Ichimiya
Phys. Rev. B 70 (2004) 245422-1-6.
A coherent positron beam for reflection high-energy positron diffraction
A. Kawasuso, T. Ishimoto, M. Maekawa, Y. Fukaya, K. Hayashi and A. Ichimiya
Rev. Sci. Inst. 75 (2004) 4585-4588.
Investigation of SiO2/SiC interface using positron annihilation technique
M. Maekawa, A. Kawasuso, M. Yoshikawa, Z. Q. Chen and A. Ichimiya
Materials Science Forum 457-456 (2004) 1301-1304.
Evolution of voids in Al+-implanted ZnO probed by a slow positron beam
Z. Q. Chen, M. Maekawa, S. Yamamoto, A. Kawasuso, X. L. Yuan, T. Sekiguchi, R. Suzuki, T. Ohdaira
Phys. Rev. B 69 (2004) 35210-35219.
Kinematical and Dynamical Analyses of Reflection High Energy Positron Diffraction (RHEPD) Patterns from Si(111)7×7 Surfaces
K. Hayashi, Y. Fukaya, A. Kawasuso and A. Ichimiya
Appl. Surf. Sci. 237 (2004) 34-39.
Precise determination of surface Debye temperature from a Si(111)-7x7 surface by reflectrion high energy positron diffraction
Y. Fukaya, A. Kawasuso, K. Hayashi and A. Ichimiya
Appl. Surf. Sci. 237 (2004) 29-33.
Interface properties of 4H SiC MOS structures studied by a slow positron beam
M. Maekawa, A. Kawasuso, M. Yoshikawa,A. Ichimiya
Materials Science Forum 445-446 (2004) 144-146.
Ion-implantation Induced Defects in ZnO Studied by a Slow Positron Beam
Z. Q. Chen, M. Maekawa, T. Sekiguchi, R. Suzuki, A. Kawasuso
Materials Science Forum 445-446 (2004) 57-59.
Observation of fast positron diffraction from a Si(111)7x7 surface
A. Kawasuso, Y. Fukaya, K. Hayashi, M. Maekawa, T. Ishimoto, S. Okada and A. Ichimiya
Materials Science Forum 445-446 (2004) 385-389.
N+ ion-implantation induced defects in ZnO studied by slow positron beam
Z.Q.Chen, Yamamoto, M.Maekawa, A.Kawasuso, X.L.Yuan, T.Sekiguchi
J. Phys. Condens. Matter 16 (2004) S293-S299.
2003
Top Most Surface Studies by Total Reflection Positron Diffraction
A. Kawasuso, T. Ishimoto, Y. Fukaya, K. Hayashi and A. Ichimiya
e-J. Surf. Sci. Nanotech. 1 (2003) 152-157.
Si(111)-7 x 7 surface probed by reflection high-energy positron diffraction
A. Kawasuso, Y. Fukaya, K. Hayashi, M. Maeakawa, S. Okada and A. Ichimiya
Phys. Rev. B 68 (2003) 241313(R).
Vacancy defects detected by positron annihilation
A. Kawasuso, M. Weidner, F. Redmann, T. Frank, M. Yoshikawa, T. Itoh, P. Sperr, G. Koegel, W. Triftshaeuser, R. Krause-Rehberg, G. Pensl
'Silicon Carbide, Recent Majour Advances', eds. G. Pensl, H. Matsunami and J. Choyke, Springer, Berlin (2003). pp. 563-584.
Fluorine-doping in titanium dioxide by ion implantaion technique
T. Yamaki, T. Umebayashi, T. Sumita, S. Yamamoto, M. Maekawa, A. Kawasuso and H. Itoh
Nucl. Inst. & Meth. In Phys. Res. B 206 (2003) 254-258.
Postgrowth Annealing of Defects in ZnO Studied by Positron Annihilation, X-ray Diffraction, Rutherford Backscattering, Cathodoluminescence and Hall Measurement
Z.Q. Chen, S. Yamamoto, M. Maekawa, A.Kawasuso, T.Sekiguchi
J. Appl. Phys. 94 (2003) 4807-4812.
SiO2-SiC interface proved by positron annihilation
M. Maekawa, A. Kawasuso, M. Yoshikawa and H. Itoh
Appl. Surf. Sci. 216 (2003) 365-370.
Structural defects at SiO2-SiC interfaces detected by positron annihilation
M. Maekawa, A. Kawasuso, M. Yoshikawa, and H. Itoh
Materials Science Forum 433-436 (2003) 559-562.
Polytype-dependent vacancy annealing studied by positron annihilation
A. Kawasuso, M. Yoshikawa, M. Maekawa, H. Itoh, T. Chiba, F. Redmann, R. Krause-Rehberg, M. Weidner, T. Frank, G. Pensl
Materials Science Forum 433-436 (2003) 477-480.
2002
Reflection High-Energy Positron Diffraction at Solid Surfaces by Improved Electrostatic Positron Beam
A. Kawasuso, T. Ishimoto, S. Okada, H. Itoh and A. Ichimiya
Appl. Surf. Sci. 194 (2002) 287-290.
Improvement of the electrostatic positron beam and observation system for RHEPD experiment
T. Ishimoto, A. Kawasuso, H. Itoh
Appl. Surf. Sci. 194 (2002) 43-46.
Radiation-induced defects in 4H and 6H SiC epilayers studied by positron annihilation and deep level transient spectroscopy
A. Kawasuso, M. Weidner, F. Redmann, T. Frank, R. Krause-Rehberg, G. Pensl, P. Sperr, M. Yoshikawa, K. Kojima and H. Itoh,
Materials Science Forum 389-393 (2002) 489-493.
2001
Defects in 30 keV Er+ -implanted SiO2/Si studied by positron annihilation and cathodoluminescence
K. Hirata, H. Arai, A. Kawasuso, T. Sekiguchi, Y. Kobayashi and S. Okada
J. Appl. Phys. 90 (2001) 237-242.
Development of pulsed MeV positron beam line
M. Maekawa, M. Kondo, S. Okada, A. Kawasuso and H. Itoh
Rad. Phys. Chem. 60 (2001) 525-528.
Research and Development of High Energy Pulsed Positron Beam
M. Maekawa, A. Kawasuso, S. Okada, H. Itoh
Materials Science Forum 363-365 (2001) 658-660.
Annealing behavior of vacancies and Z1/2 levels in electron-irradiated 4H-SiC studied by positron annihilation and deep level transient spectroscopy
A. Kawasuso, F. Redmann, R. Krause-Rehberg, M. Weidner, T. Frank, G. Pensl, P. Sperr, W. Triftshauser and H. Itoh
Appl. Phys. Lett. 79 (2001) 3950-3952.
Formation and annihilation of intrinsic-related defects in high-energy electron-irradiated or He irradaited 4H SiC
M. Weidner, T. Frank, G. Pensl, A. Kawasuso, H. Itoh, R. Krause-Rehberg
Physica B: Condensed Matter 308-310 (2001) 633-636.
Reflection High-Energy Positron Diffraction: Solved and unsolved problems
A. Kawasuso, K. Kojima, M. Yoshikawa, K. Narumi, S. Okada, H. Itoh and A. Ichimiya
Materials Science Forum 363-365 (2001) 445-447.
Effect of illumination on positron lifetime in electron-irradiated 6H SiC
F. Redmann, A. Kawasuso, R. Krause-Rehberg, H. Itoh
Materials Science Forum 363-365 (2001) 126-128.
Annealing processes of defects in epitaxial SiC irradiated by He and electron
A.Kawasuso, F. Redmann, R. Krause-Rehberg, P. Sperr, M. Weidner, T. Frank, G. Pensl, H. Itoh
Materials Science Forum 353-356 (2001) 537-540.
Positron annihilation due to silicon vacancies in 3C and 6H SiC induced by 1 MeV electron irradiation
A. Kawasuso, F. Redmann, R. Krause-Rehberg, M. Yoshikawa, K. Kojima and H. Itoh
Phys. Stat. Sol. (b) 223 (2001) R8-10.
Vacancies and deep levels in electron-irradiated 6H SiC epilayers studied by positron annihilation and deep level transient spectroscopy
A. Kawasuso, F. Redmann, R. Krause-Rehberg,T. Frank, M. Weidner, G. Pensl,P. Sperr,H. Itoh
J. Appl. Phys. 90 (2001) 3377-3382.
Vacancies in He-implanted 4H and 6H SiC epilayers studied by positron annihilation
A. Kawasuso, M. Weidner, F. Redmann, T. Frank, P. Sperr, R. Krause-Rehberg and G. Pensl
Physica B: Condensed Matter 308-310 (2001) 660-663.
Illumination effects in irradiated 6H n-type SiC observed by positron annihilation spectroscopy
F. Redmann, A. Kawasuso, H. Itoh, R. Krause-Rehberg
Physica B: Condensed Matter 308-310 (2001) 629-632.
2000
Effect of radiation damage on luminescence of Er-implanted SiO2/Si studied by slow positron beam
A. Kawasuso, H. Arai, K. Hirata, T. Sekiguchi, Y. Kobayashi and S. Okada
Rad. Phys. Chem. 58 (2000) 615-619.
Rocking curves of reflection high-energy positron diffraction from hydrogen-terminated Si(111) surfaces
A. Kawasuso, M. Yoshikawa, K. Kojima, S. Okada and A. Ichimiya
Phys. Rev. B 61 (2000) 2102-2106.
Development and application of reflection high-energy positron diffraction
A. Kawasuso, S. Okada and A. Ichimiya
Nuclear Instrument & Methods in Phys. Res. B 171 (2000) 219-230.
Effect of hydrogen etching on morphology of 6H SiC surface studied by reflection high-energy positron diffraction and atomic force microscopy
A. Kawasuso, K. Kojima, K. Narumi, M. Yoshikawa and H. Itoh
Appl. Phys. Lett. 76 (2000) 1119-1121.
1998
Silicon vacancies in 3C-SiC observed by positron lifetime and electron spin resonance
A. Kawasuso, H. Itoh, M. Morishita, M. Yoshikawa, T. Ohshima, I. Nashiyama, S. Okada, H. Okumura and S. Yoshida
Appl. Phys. A 67 (1998) 209-212.
Reflection High Energy Positron Diffraction from a Si (111) Surface
A. Kawasuso and S. Okada
Phys. Rev. Lett. 81 (1998) 2695-2698.
1997
Internal positron source production with a Cyclotron and vacancy study in Si
A. Kawasuso, S. Masuno, S. Okada, M. Hasegawa and M. Suezawa
JAERI-Conf. 97-003 (1997) 476-479.
Characterization of defects in electron irradiated 6H-SiC by positron lifetime and electron spin resonance
A. Kawasuso, H. Itoh, D. Cha and S. Okada
Materials Science Forum 264-268 (1997) 611-614.
Annealing processes of vacancy-type defects in as-grown and 3 MeV electron-irradiated 6H-SiC studied by positron lifetime Measurement
A. Kawasuso, H. Itoh, S. Okada and H. Okumura
J. Appl. Phys. 80 (1996) 5639-5645.
Positron annihilation in electron-irradiated SiGe bulk crystals
A. Kawasuso, S. Okada, M. Suezawa, I. Yonenaga and T. Honda
J. Appl. Phys. 81 (1997) 2916-2918.
Anomalous temperature dependence of positron trapping due to divacancies in Si
A. Kawasuso and S. Okada
Jpn. J. Appl. Phys. 36 (1997) 605-611.
Vacancy-hydrogen interaction in proton-implanted Si studied by positron lifetime and infrared absorption measurements
A. Kawasuso, H. Arai, S. Okada
Materials Science Forum 255-257 (1997) 548-550.
Positron 2D-ACAR Study of Divacancies in Si: Experiments and Theory
M. Hasegawa, Z. Tang, T. Chiba, M. Saito, A. Kawasuso, T. Akahane, Z-Q. Li, Y. Kawazoe and S. Yamaguchi
Materials Sceince Forum 255-257 (1997) 414-416.
Positron annihilation study of electron irradiated SiGe bulk alloys
A. Kawasuso, S. Okada, I. Yonenaga, T. Honda, M. Suezawa
Materials Sceince Forum 258-263 (1997) 127-132.
Anisotropy in the positron 2D angular correlation of annihilation radiation for singly negative divacancies in Si
Z. Tang, M. Hasegawa, T. Chiba, M. Saito, A. Kawasuso, Z.Q.Li, R.T.Fu, T. Akahane, Y. Kawazoe and S. Yamaguchi
Phys. Rev. Lett. 78 (1997) 2236-2239.
Characterization of defects in electron irradiated 6H-SiC by positron lifetime and electron spin resonance
A. Kawasuso, H. Itoh, D. Cha, and S. Okada
Materials Science Forum 264-268 (1997) 611-614.
Vacancy production in 6H-SiC irradiated with 3 MeV electrons studied by positron lifetime spectroscoty
A. Kawasuso, H. Itoh, T. Ohshima, K. Abe and S. Okada
J. Appl. Phys. 82 (1997) 3232-3238.
Intrinsic defects in cubic silicon carbide
H. Itoh, A. Kawasuso, T. Ohshima, M. Yoshikawa, I. Nashiyama, S. Tanigawa, S. Misawa, H. Okumura and S. Yoshida
Phys. Stat. Sol. (a) 162 (1997) 173-198.
1995
An annealing study of defects induced by electron irradition of Czochralski-grown Si using postiron lifetime technique
A. Kawasuso, M. Hasegawa, M. Suezawa, S. Yamaguchi and K. Sumino
Applied Surface Science 85 (1995) 280-286.
Annealing processes of radiation-induced defects in Si; Analysis using positron lifetime measurement
A. Kawasuso, M. Hasegawa, M. Suezawa, S. Yamaguchi and K. Sumino
Materials Science Forum 175-178 (1995) 423-426.
Positron 2D-ACAR study on divacancy in Si
T. Chiba, A. Kawasuso, M. Hasegawa, M. Suezawa, T. Akahane, and K. Sumino
Materials Science Forum 175-178 (1995) 327-330.
Charge state dependences of positron trapping rates associated with divacancies and vacancy-phosphorus pairs in Si
A. Kawasuso, M. Hasegawa, M. Suezawa, S. Yamaguchi and K. Sumino
Jpn. J. Appl. Phys. 34 (1995) 2197-2206.
Positron annihilation in divacancies in Si: Lifetime and 2D-ACAR
M. Hasegawa, A. Kawasuso, T. Chiba, T. Akahane, M. Suezawa, S. Yamagichi and K. Sumino
Appl. Phys. A 61 (1995) 65-70.
Positron annihilations associated with defects in plastically deformed Si
A. Kawasuso, M. Suezawa, M. Hasegawa, S. Yamaguchi and K. Sumino
Jpn. J. Appl. Phys. 34 (1995) 4579-4586.
A positron lifetime study of plastically deformed Si
A. Kawasuso, M. Suezawa, M. Hasegawa, S. Yamaguchi and K. Sumino
Materials Science Forum 196-201 (1995) 1177-1182.
Positron annihilation 2D-ACRA study of divacancies and vacancy-oxygen pairs in Si
M. Hasegawa, T. Chiba, A. Kawasuso, T. Akahane, M. Suezawa, S. Yamagichi and K. Sumino
Materials Science Forum 196-201 (1995) 1481-1489.
Study of divacancy in Si using positron lifetime measurement
A. Kawasuso, M. Hasegawa, M. Suezawa, S. Yamaguchi and K. Sumino
Hyperfine Interactions 84 (1994) 397-406.
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