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Kojima, Seiji*; Novikov, V. N.*; Kofu, Maiko; Yamamuro, Osamu*
Physica Status Solidi (B), 257(11), p.2000073_1 - 2000073_6, 2020/11
Times Cited Count：3 Percentile：19.14(Physics, Condensed Matter)Heussner, F.*; Talmelli, G.*; Geilen, M.*; Heinz, B.*; Br
cher, T.*; Meyer, T.*; Ciubotaru, F.*; Adelmann, C.*; Yamamoto, Kei; Serga, A. A.*; et al.
Physica Status Solidi; Rapid Research Letters, 14(4), p.1900695_1 - 1900695_6, 2020/04
Times Cited Count：34 Percentile：88.25(Materials Science, Multidisciplinary)
S
films; Case of pre-reactionSakaguchi, Yoshifumi*; Hanashima, Takayasu*; Aoki, Hiroyuki; Asaoka, Hidehito; Simon, A.-A. A.*; Mitkova, M.*
Physica Status Solidi (A), 215(12), p.1800049_1 - 1800049_12, 2018/06
Times Cited Count：6 Percentile：30.02(Materials Science, Multidisciplinary)Shimaoka, Takehiro*; Kaneko, Junichi*; Sato, Yuki; Tsubota, Masakatsu*; Shimmyo, Hiroaki*; Chayahara, Akiyoshi*; Watanabe, Hideyuki*; Umezawa, Hitoshi*; Mokuno, Yoshiaki*
Physica Status Solidi (A), 213(10), p.2629 - 2633, 2016/10
Times Cited Count：10 Percentile：41.05(Materials Science, Multidisciplinary)Yamaguchi, Hisato*; Ogawa, Shuichi*; Watanabe, Daiki*; Hozumi, Hideaki*; Gao, Y.*; Eda, Goki*; Mattevi, C.*; Fujita, Takeshi*; Yoshigoe, Akitaka; Ishizuka, Shinji*; et al.
Physica Status Solidi (A), 213(9), p.2380 - 2386, 2016/09
Times Cited Count：13 Percentile：52.21(Materials Science, Multidisciplinary)We report valence-band electronic structure evolution of graphene oxide (GO) upon its thermal reduction. The degree of oxygen functionalization was controlled by annealing temperature, and an electronic structure evolution was monitored using real-time ultraviolet photoelectron spectroscopy. We observed a drastic increase in the density of states around the Fermi level upon thermal annealing at 
600
C. The result indicates that while there is an apparent bandgap for GO prior to a thermal reduction, the gap closes after an annealing around that temperature. This trend of bandgap closure was correlated with the electrical, chemical, and structural properties to determine a set of GO material properties that is optimal for optoelectronics. The results revealed that annealing at a temperature of 500C leads to the desired properties, demonstrated by a uniform and an order of magnitude enhanced photocurrent map of an individual GO sheet compared to an as-synthesized counterpart.
Sakaguchi, Yoshifumi*; Asaoka, Hidehito; Uozumi, Yuki; Kawakita, Yukinobu; Ito, Takayoshi*; Kubota, Masato; Yamazaki, Dai; Soyama, Kazuhiko; Sheoran, G.*; Mitkova, M.*
Physica Status Solidi (A), 213(7), p.1894 - 1903, 2016/07
Times Cited Count：7 Percentile：33.84(Materials Science, Multidisciplinary)no abstracts in English
Onoda, Shinobu; Haruyama, Moriyoshi; Teraji, Tokuyuki*; Isoya, Junichi*; Kada, Wataru*; Hanaizumi, Osamu*; Oshima, Takeshi
Physica Status Solidi (A), 212(11), p.2641 - 2644, 2015/11
Times Cited Count：11 Percentile：44.78(Materials Science, Multidisciplinary)
Fe
O
(: rare earths)Yoshii, Kenji; Funae, Takeshi*; Mizumaki, Masaichiro*; Ejiri, Hiroki*; Ikeda, Naoshi*; Saito, Hiroyuki; Matsumura, Daiju
Physica Status Solidi (C), 12(6), p.841 - 844, 2015/06
Times Cited Count：1 Percentile：40.38(Physics, Condensed Matter)We report the effects of elemental substitutions in multiferroic FeO (
: Y, Ho-Lu, In). The substitution by nonmagnetic Ga
at the Fe site, which has not been reported so far, shows a drastic decrease in the ferrimagnetic transition temperature (
). This is plausibly owing to the suppression of magnetic interactions between Fe ions, based on our previous results of other substituted systems such as FeCoO. Dielectric constants near room temperature were comparable to those of FeO. The suppression of dielectric loss in this system is suitable to application. The -site substitution was also attempted by the large R ions such as Dy. The solubility limit was up to about 10% of ions, as confirmed by XRD and EXAFS measurements. was raised by 5-10 K for Dy substitution.
studied by X-ray spectroscopyMizumaki, Masaichiro*; Fujii, Hitoshi*; Yoshii, Kenji; Hayashi, Naoaki*; Saito, Takashi*; Shimakawa, Yuichi*; Uozumi, Takayuki*; Takano, Mikio*
Physica Status Solidi (C), 12(6), p.818 - 821, 2015/06
Times Cited Count：10 Percentile：94.36(Physics, Condensed Matter)We investigated the electronic structure of BaFeO by using HAXPES and XAS measurements and first principle studies. The experimental and theoretical results indicated that BaFeO is a negative charge transfer compound. We concluded that the on-site Coulomb energy and the strong hybridization between Fe-3d and O-2p orbitals play a very important role of emergence of negative charge transfer. And we found the new structure in the Fe-2p XPS spectrum and concluded this structure is originated from non-local screening.
Amekura, Hiroshi*; Kono, Kenichiro*; Okubo, Nariaki; Ishikawa, Norito
Physica Status Solidi (B), 252(1), p.165 - 169, 2015/01
Times Cited Count：10 Percentile：41.9(Physics, Condensed Matter)Zinc nanoparticles (NPs) of 10 nm in diameter were irradiated with 200 MeV Xe
ions with various fluences. The shape elongation of the NPs and the mean inter-particle (IP) distance were evaluated by small angle X-ray scattering (SAXS) in the transmission configuration using synchrotron X-ray of 18 keV. The azimuth angle dependence of SAXS signal, which was isotropic for unirradiated state, changed to anisotropic. It indicated that the NPs collectively deformed from spheres to spheroids.
-FeSi
film on Si(100)Yamaguchi, Kenji; Hamamoto, Satoshi*; Hojo, Kiichi
Physica Status Solidi (C), 10(12), p.1699 - 1703, 2013/12
Times Cited Count：0 Percentile：0.01(Nanoscience & Nanotechnology)Effect of substrate treatment conditions, deposition temperature and deposition rate on the crystallinity of -FeSi films formed on Si substrate was investigated. The substrates were treated with Ne
ion beams at room temperature and then annealed at 1073 K prior to film fabrication by means of ion beam sputter deposition (IBSD) method. Combinations of experimental parameters which promote the epitaxial relationship of -FeSi (100) // Si (100) were defined. Complicated dependence of these experimental parameters on the film structure indicated that careful optimization of substrate treatment conditions and deposition parameters would enable to obtain -FeSi films with excellent crystalline properties.
Mn
Si/Ge(111) heteroepitaxial interfacesNoguchi, Masaya*; Hirata, Tomoaki*; Kawakubo, Yuki*; Narumi, Kazumasa; Sakai, Seiji; Maeda, Yoshihito
Physica Status Solidi (C), 10(12), p.1732 - 1734, 2013/12
Times Cited Count：0 Percentile：0.01(Nanoscience & Nanotechnology)(Mn
Fe)Si(111) epitaxially grown on Ge(111)Kawakubo, Yuki*; Noguchi, Masaya*; Hirata, Tomoaki*; Narumi, Kazumasa; Sakai, Seiji; Yamada, Shinya*; Hamaya, Kohei*; Miyao, Masanobu*; Maeda, Yoshihito
Physica Status Solidi (C), 10(12), p.1828 - 1831, 2013/12
Times Cited Count：0 Percentile：0.01(Nanoscience & Nanotechnology)Si/FeSi artificial latticesSakai, Kenichiro*; Noda, Yuta*; Takeda, Kaoru*; Takeda, Masayasu; Yoshitake, Tsuyoshi*
Physica Status Solidi (C), 10(12), p.1862 - 1865, 2013/12
Times Cited Count：1 Percentile：53.13(Nanoscience & Nanotechnology)Sasaki, Takuo; Norman, A. G.*; Romero, M. J.*; Al-Jassim, M. M.*; Takahashi, Masamitsu; Kojima, Nobuaki*; Oshita, Yoshio*; Yamaguchi, Masafumi*
Physica Status Solidi (C), 10(11), p.1640 - 1643, 2013/11
Times Cited Count：4 Percentile：83.46(Physics, Applied)Onishi, Hiroaki
Physica Status Solidi (B), 250(3), p.553 - 556, 2013/03
Times Cited Count：0 Percentile：0(Physics, Condensed Matter)
and reference compound ThCd; Studied by the de Haas-van Alphen effectHirose, Yusuke*; Miura, Yasunao*; Tsutsumi, Hiroki*; Yoshiuchi, Shingo*; Oya, Masahiro*; Sugiyama, Kiyohiro*; Takeuchi, Tetsuya*; Yamagami, Hiroshi*; Yamamoto, Etsuji; Haga, Yoshinori; et al.
Physica Status Solidi (B), 250(3), p.642 - 645, 2013/03
Times Cited Count：4 Percentile：20.45(Physics, Condensed Matter)Kubo, Katsunori
Physica Status Solidi (C), 10(3), p.544 - 548, 2013/03
Times Cited Count：5 Percentile：89.73(Materials Science, Multidisciplinary)
and analysis of oxygen diffusion in PuO and (Pu,U)OKato, Masato; Uchida, Teppei; Sunaoshi, Takeo*
Physica Status Solidi (C), 10(2), p.189 - 192, 2013/02
Times Cited Count：5 Percentile：89.73(Materials Science, Multidisciplinary) pelletUchida, Teppei; Sunaoshi, Takeo*; Kato, Masato
Physica Status Solidi (C), 10(2), p.193 - 196, 2013/02
Times Cited Count：4 Percentile：86.2(Materials Science, Multidisciplinary)