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Takahashi, Tomoyuki*; Fukaya, Yukiko*; Iimoto, Takeshi*; Uni, Yasuo*; Kato, Tomoko; Sun, S.*; Takeda, Seiji; Nakai, Kunihiro*; Nakabayashi, Ryo*; Uchida, Shigeo*; et al.
Hoken Butsuri (Internet), 56(4), p.288 - 305, 2021/12
We report the results of activities related to the Task Group of Parameters Used in Biospheric Dose Assessment Models for Radioactive Waste Disposal at the Japan Health Physics Society.
Kim, J.*; Yamanaka, Satoru*; Nakajima, Akira*; Kato, Takanori*; Kim, Y.*; Fukuda, Tatsuo; Yoshii, Kenji; Nishihata, Yasuo; Baba, Masaaki*; Takeda, Masatoshi*; et al.
Advanced Sustainable Systems (Internet), 2(11), p.1800067_1 - 1800067_8, 2018/11
Times Cited Count:7 Percentile:27.76(Green & Sustainable Science & Technology)Moro, Takuya*; Kim, J.*; Yamanaka, Satoru*; Murayama, Ichiro*; Kato, Takanori*; Nakayama, Tadachika*; Takeda, Masatoshi*; Yamada, Noboru*; Nishihata, Yasuo; Fukuda, Tatsuo; et al.
Journal of Alloys and Compounds, 768, p.22 - 27, 2018/11
Times Cited Count:17 Percentile:66.2(Chemistry, Physical)Kim, J.*; Yamanaka, Satoru*; Nakajima, Akira*; Kato, Takanori*; Kim, Y.*; Fukuda, Tatsuo; Yoshii, Kenji; Nishihata, Yasuo; Baba, Masaaki*; Takeda, Masatoshi*; et al.
Ferroelectrics, 512(1), p.92 - 99, 2017/08
Times Cited Count:14 Percentile:56.08(Materials Science, Multidisciplinary)Yamanaka, Satoru*; Kim, J.*; Nakajima, Akira*; Kato, Takanori*; Kim, Y.*; Fukuda, Tatsuo; Yoshii, Kenji; Nishihata, Yasuo; Baba, Masaaki*; Yamada, Noboru*; et al.
Advanced Sustainable Systems (Internet), 1(3-4), p.1600020_1 - 1600020_6, 2017/04
no abstracts in English
Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Sakai, Kenji; Nakamura, Mitsutaka; Aizawa, Kazuya; Arai, Masatoshi; Noda, Yohei; et al.
Journal of Physics; Conference Series, 294(1), p.012017_1 - 012017_7, 2011/06
Times Cited Count:2 Percentile:65.52(Physics, Applied)Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Sakai, Kenji; Nakamura, Mitsutaka; Suzuya, Kentaro; Aizawa, Kazuya; Arai, Masatoshi; et al.
Journal of Physics; Conference Series, 294(1), p.012004_1 - 012004_7, 2011/06
Times Cited Count:2 Percentile:65.52(Physics, Applied)Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Sakai, Kenji; Nakamura, Mitsutaka; Suzuya, Kentaro; Aizawa, Kazuya; Arai, Masatoshi; et al.
Physica B; Condensed Matter, 406(12), p.2443 - 2447, 2011/06
Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Sakai, Kenji; Nakamura, Mitsutaka; Suzuya, Kentaro; Aizawa, Kazuya; Arai, Masatoshi; et al.
Physica B; Condensed Matter, 406(12), p.2443 - 2447, 2011/06
Times Cited Count:3 Percentile:16.25(Physics, Condensed Matter)Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Sakai, Kenji; Nakamura, Mitsutaka; Suzuya, Kentaro; Arai, Masatoshi; Takeda, Masayasu; et al.
Nuclear Instruments and Methods in Physics Research A, 634(1, Suppl.), p.S122 - S125, 2011/04
Hiraka, Haruhiro*; Wakimoto, Shuichi; Takeda, Masayasu; Kakurai, Kazuhisa; Matsumura, Daiju; Nishihata, Yasuo; Mizuki, Junichiro; Yamada, Kazuyoshi*
Journal of Physics; Conference Series, 200, p.012059_1 - 012059_4, 2010/02
Times Cited Count:0 Percentile:0.04(Materials Science, Multidisciplinary)We studied Fe-dopant effects on spin correlations in BiPbSrCuO. Magnetic neutron elastic scattering, which is absent in a pristine sample, has been observed at incommensurate positions with an incommensurability of 0.2. Surprisingly, this anomalously large follows a linear relation even in the overdoped region, unlike for LaSrCuO. We discuss this specific feature observed in the overdoped phase from a dynamical stripe viewpoint.
Takeda, Masayasu; Endo, Yasuo; Kakurai, Kazuhisa; Onose, Yoshinori*; Suzuki, Junichi; Tokura, Yoshinori*
Journal of the Physical Society of Japan, 78(9), p.093704_1 - 093704_4, 2009/09
Times Cited Count:18 Percentile:68.36(Physics, Multidisciplinary)The complex phase transition of the magnetic long-range order in FeCoSi has been investigated by small-angle neutron scattering (SANS) measurement at low temperatures under an external magnetic field. A variety of scattering patterns, such as ring, crescent-shaped, and diffusive spots, were observed by changing temperature and applying a magnetic field. The results could be interpreted by an analogy of the phase transition of the liquid crystal when the net magnetization is regarded as the director of the liquid crystal.
Okamoto, Jun*; Okane, Tetsuo; Saito, Yuji; Terai, Kota*; Fujimori, Shinichi; Muramatsu, Yasuji*; Yoshii, Kenji; Mamiya, Kazutoshi*; Koide, Tsuneharu*; Fujimori, Atsushi; et al.
Physical Review B, 76(18), p.184441_1 - 184441_5, 2007/11
Times Cited Count:34 Percentile:76.82(Materials Science, Multidisciplinary)CaSrRuO, which is ferromagnetic for Sr concentration x 0.3, has been studied by X-ray magnetic circular dichroism (XMCD) in Ru 3 and O 1 core-level X-ray absorption. XMCD signals appear at x 0.3 and monotonically increases with x in the ferromagnetic phase. While the monotonic increase of the XMCD signals with x is of a typical Stoner-type, the absence of appreciable change in the spectral line shapes of both the Ru 3 and O 1 XMCD spectra indicate that the itinerant-electron ferromagnetism in CaSrRuO is influenced by strong electron correlation.
Takeda, Masayasu; Mibu, Ko*; Shinjo, Teruya*; Endo, Yasuo*; Suzuki, Junichi
Physical Review B, 70(10), p.104408_1 - 104408_9, 2004/09
Times Cited Count:8 Percentile:41.01(Materials Science, Multidisciplinary)Detailed magnetic structure of spin-density waves (SDWs) in epitaxial Cr(001)/Sn multilayer was investigated by neutron scattering combined with Mssbauer spectroscopic studies. Monatomic Sn layers were embedded in 240 nm thick Cr(001) films with varying the periodic spacing from 4.2 to 16.2 nm. All samples were revealed to be a commensurate antiferromagnetic (CAF) phase at 300 K. The CAF structures changed to incommensurate SDW states with complex waveforms whose wavelength are controlled by the artificial periodicity at low temperatures although the CAF structure in the sample with the period of 4.2 nm persisted even at 10 K. The phase transition depends on the thickness of the Cr layers intervening between Sn monatomic layers. An appreciable phase slip in the SDW was observed during the phase transition in the sample with the period of 10.2 nm. The SDW structure is discussed by taking account of the competing forces between the nesting of Fermi surface and a pinning of antinodes at the Sn monatomic layers.
Takeda, Masayasu; Endo, Yasuo*; Kamijo, Atsushi*; Langridge, S.*; Dalgliesh, R.*; Her, J. H.*; Lee, K. B.*
Transactions of the Materials Research Society of Japan, 28, p.23 - 26, 2003/11
no abstracts in English
Takeda, Masayasu; Endo, Yasuo; Onose, Yoshinori*; Kakurai, Kazuhisa; Suzuki, Junichi; Tokura, Yoshinori*
no journal, ,
A ferromagnetic metal, FeCoSi (), has a long-period helical spin structure due to the Dzyalosinsky-Moriya interaction. The Chirality of the helical structure decides either clockwise or anti-clockwise because the cubic B20 structure lacks the inversion center. We conclude that a new magnetic phase (a magnetic liquid crystal phase) exists in FeCoSi under the external magnetic fields judging from the detailed magnetization process determined by polarized neutron small angle scattering measurements.
Takeda, Masayasu; Endo, Yasuo; Onose, Yoshinori*; Kakurai, Kazuhisa; Suzuki, Junichi; Tokura, Yoshinori*
no journal, ,
Complex phase transition of magnetic long range order in FeCoSi has been investigated by small-angle neutron scattering (SANS) measurements. We found liquidcrystal-like behavior of the magnetic textures under external magnetic fields. A variety of the scattering patterns, ring, crescent-shape, diffusive spots etc. appeared by changing temperatures and applying magnetic fields. This behavior can be explained by an analogy of the phase transition of the liquid crystal when the net magnetization of the conical state under the magnetic fields is regarded as the director of the liquid crystals.
Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Suzuki, Junichi; Nakamura, Mitsutaka; Arai, Masatoshi; Endo, Yasuo; Kakurai, Kazuhisa; Takeda, Masayasu; Wakimoto, Shuichi; et al.
no journal, ,
Polarized neutron scattering is a powerful technique in order to clarify the magnetic structure of materials. The technique is often used in JRR-3 nowadays. However, the available energy has been limited below 100 meV as long as we use the conventional polarizing method. To realize polarized neutron scattering experiments above the energy, the use of He spin filters is the best solution. In addition, in the new pulsed neutron facility, J-PARC, the neutron source has wide energy spectrum. To polarize all the neutrons, it is desired to use the He spin filters. Taking these backgrounds into account, we are now planning to introduce He neutron spin filters to polarized neutron experiments at JRR-3 and J-PARC. In our oral presentation, we report the detailed plan of the experiments and the present status of the preparation.
Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Suzuki, Junichi; Nakamura, Mitsutaka; Arai, Masatoshi; Endo, Yasuo; Kakurai, Kazuhisa; Takeda, Masayasu; Wakimoto, Shuichi; et al.
no journal, ,
no abstracts in English
Tsutsumi, Kenji*; Oyama, Kenji*; Hiraka, Haruhiro*; Yamaguchi, Yasuo*; Ino, Takashi*; Oku, Takayuki; Sakaguchi, Yoshifumi; Kira, Hiroshi; Arimoto, Yasushi*; Takeda, Masayasu; et al.
no journal, ,
no abstracts in English