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symmetry in CeCu
Ge; Soft X-ray absorption and hard X-ray photoemission spectroscopyAratani, Hidekazu*; Nakatani, Yasuhiro*; Fujiwara, Hidenori*; Kawada, Moeki*; Kanai, Yuina*; Yamagami, Kohei*; Fujioka, Shuhei*; Hamamoto, Satoru*; Kuga, Kentaro*; Kiss, Takayuki*; et al.
Physical Review B, 98(12), p.121113_1 - 121113_6, 2018/09
Times Cited Count：5 Percentile：25.82(Materials Science, Multidisciplinary)
-FeSi nanocrystalsMaeda, Yoshihito; Nishimura, Kentaro*; Nakajima, Takahito*; Matsukura, Bui*; Narumi, Kazumasa; Sakai, Seiji
Physica Status Solidi (C), 9(10-11), p.1884 - 1887, 2012/10
Times Cited Count：4 Percentile：88.47(Materials Science, Multidisciplinary)We report enhancement of intrinsic photoluminescence (PL) from -FeSi nanocrystals by doping carbon. In the appropriate dose of C
ion implantation into the average nanocrystal size of 14 nm, the PL intensity was enhanced by 260% and increase of the exciton binding energy of 1.8 meV in comparison with that of the non-doped nanocrystal. Furthermore, we found that there was a clear correlation between the PL enhancement and increase of the exciton binding energy. This important result suggests that carbon atoms doped in the silicide lattice may play as an isoelectronic trap and probably form bound excitons with stable states as predicted theoretically. We found a new mechanism of the PL enhancement for -FeSi nanocrystals.
-FeSi nanocrystals embedded in SiMaeda, Yoshihito; Nishimura, Kentaro*; Nakajima, Takahito*; Matsukura, Bui*; Narumi, Kazumasa; Sakai, Seiji
Physica Status Solidi (C), 9(10-11), p.1888 - 1891, 2012/10
Times Cited Count：3 Percentile：83.25(Materials Science, Multidisciplinary)We have systematically investigated photoluminescence (PL) properties of -phase nanocrystals which are formed by a phase transition from metastable 
-FeSi with a Fluorite structure to -FeSi, and succeeded in enhancement of the PL intensity in the optimum conditions of double annealing process. For the PL enhancement, the time of postannealing at 800
C is dominated by the time of the preannealing at 400 or 500C which is related to amount of the -phase. After discussing some possible factors, we speculate that the PL enhancement observed in this study may be attributed mainly to improvement of the interface condition between the nanocrystal and Si, because the crystallographic epitaxial relationship among the phases, Si(111)//(111)//(202)/(220) can be maintained during precipitation of the nanocrystal on Si(111).
Arakawa, Manabu*; Narumi, Kentaro; Machida, Hideo*; Onizawa, Kunio
Proceedings of 2011 ASME Pressure Vessels and Piping Conference (PVP 2011) (CD-ROM), 8 Pages, 2011/07
This paper describes the benchmark analysis results performed between two PFM analysis codes for structural reliability evaluation of primary loop recirculation system (PLR) piping of a boiling water reactor. The two codes PASCAL-SP and PEPPER-M used for this benchmark analysis have been independently developed by Japan Atomic Energy Agency and TEPCO Systems Corporation, respectively. After the validity of the deterministic analytical procedures in these codes was checked, the failure probability assessment of PLR piping containing cracks due to stress corrosion cracking was carried out according to some regulatory requirements and the rules on fitness-for-service in Japan. The analytical results from both codes were well in agreement. From comparison of the results, influences of some items and parameters on failure probabilities were identified.
MnSi/Ge(111) interfacesMatsukura, Bui*; Nakajima, Takahito*; Nishimura, Kentaro*; Narumi, Kazumasa; Sakai, Seiji; Maeda, Yoshihito
no journal, ,
no abstracts in English
ion implanted -FeSi with different crystal morphologiesNakajima, Takahito*; Nishimura, Kentaro*; Matsukura, Bui*; Narumi, Kazumasa; Sakai, Seiji; Maeda, Yoshihito
no journal, ,
no abstracts in English
MnSi/Ge(111) heteroepitaxial interfaces; Mn-concentration dependenceMaeda, Yoshihito; Nishimura, Kentaro*; Nagasawa, Yoshiyuki*; Narumi, Kazumasa; Sakai, Seiji
no journal, ,
no abstracts in English
-FeSi nanocrystalsNishimura, Kentaro*; Nagasawa, Yoshiyuki*; Maeda, Yoshihito*; Narumi, Kazumasa
no journal, ,
no abstracts in English
-FeSi nanocrystals by phase transition and enhancement of light emission propertyNishimura, Kentaro*; Nakajima, Takahito*; Nagasawa, Yoshiyuki*; Narumi, Kazumasa; Maeda, Yoshihito*
no journal, ,
