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He neutron spin filters on the small-angle neutron scattering spectrometer SANS-J-IISakaguchi, 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：65.41(Physics, Applied)He neutron spin filter cellsSakaguchi, 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：65.41(Physics, Applied)He neutron spin filtersSakaguchi, 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
He neutron spin filtersSakaguchi, 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：16.18(Physics, Condensed Matter)He neutron spin filter cellsSakaguchi, 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
Sr
CuO
Matsuda, Masaaki; Fujita, Masaki*; Takeda, Masayasu; Kakurai, Kazuhisa; Yamada, Kazuyoshi*
Physica C, 470(Suppl.1), p.S82 - S83, 2010/12
Times Cited Count：1 Percentile：6.46(Physics, Applied)
Pb
Sr
CuO
Hiraka, Haruhiro*; Hayashi, Yoichiro*; Wakimoto, Shuichi; Takeda, Masayasu; Kakurai, Kazuhisa; Adachi, Tadashi*; Koike, Yoji*; Yamada, Ikuya*; Miyazaki, Masanori*; Hiraishi, Masatoshi*; et al.
Physical Review B, 81(14), p.144501_1 - 144501_6, 2010/04
Times Cited Count：15 Percentile：54.92(Materials Science, Multidisciplinary)
SrCuO
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 LaSr
CuO
. We discuss this specific feature observed in the overdoped phase from a dynamical stripe viewpoint.
Tateiwa, Naoyuki; Nakagawa, Akitoshi*; Fujio, Kazuhiko*; Kawae, Tatsuya*; Takeda, Kazuyoshi*
Journal of Alloys and Compounds, 408-412, p.244 - 247, 2006/02
Times Cited Count：2 Percentile：21.8(Chemistry, Physical)The rare earth metal praseodymium (Pr) transforms from the d-fcc crystal structure (Pr-III) to 
-U one (Pr-IV) at 20 GPa with a large volume collapse (
= 0.16), which is associated with the valence change of the Pr ion. The two 4f electrons in the Pr ion is supposed to be itinerant in the Pr-IV phase. In order to investigate the electronic state of the phase IV, we performed the high-pressure electrical resistance measurement using the diamond anvil cell up to 32 GPa. In the Pr-IV phase, the temperature dependence of the resistance shows an upward negative curvature, suggestting the narrow quasiparticle band of the 4f electrons near the Fermi energy. A new phase boundary is found at 
in the Pr-IV phase. From the temperature and magnetic field dependences of the resistance at 26 GPa, the ground state of the Pr-IV phase is suggested to be magnetic. Several possibilities for the origin of are discussed.
Takeda, Korehiro; Kaneko, Hiromitsu; Watanabe, Kazuyoshi; Ochiai, Kazuya
PNC TN841 84-63, 10 Pages, 1984/10
This study was started in 1982 as the part of BEFAST programme. In this year (1984), periodical measurements of the concentrations of micro-element (Fe,Ni,Cr)in the pool water continuously perform and the results were statistically compared with the results of 1983. It seems that nosignifi
Ochiai, Kazuya; Takeda, Korehiro; Watanabe, Kazuyoshi; Komaki, Jun*
PNC TN841 84-62, 22 Pages, 1983/09
As a part of the IAEA coordinated programme on BEFAST, behavior of spent fuel assemblies during extended storage, corrosion of pool components has been investigated. In this study the concentrations of micro-elements of corrosion products (Fe, Cr, Ni) in pool water have been periodically measured and the evaluation of corrosion has been made from the results of analysis. The concentration of micro-elements of corrosion products (Fe, Cr, Ni) was almost constant during this study. Corrosion rate was estimated to be only a little as compared with the pool lining in thickness of 3 mm (the side) or 4 mm (the base).
(Sr,Ba)CuOWakimoto, Shuichi; Kakurai, Kazuhisa; Matsuda, Masaaki; Takeda, Masayasu; Fujita, Masaki*; Yamada, Kazuyoshi*; Gu, G.*; Tranquada, J. M.*; Birgeneau, R. J.*; Zhang, H.*
no journal, ,
Polarized neutron scattering exaperiments have been performed on La
Ba
CuO and La
Sr
CuO with intent to elucidate a possible effects of stripe structure to the spin dynamics. Low energy (
meV) data demonstratre that in the former sample, which has a well-ordered stripe state with Cu spins lying in the CuO
plane at 10 K, spins fluctuate only in the plane. On the other hand, the latter sample, which has very weak stripe order, shows isotropic spin fluctuation. This implies that low energy magnetic excitations are stringly affected by the stripe order.
(Sr,Ba)CuOWakimoto, Shuichi; Fujita, Masaki*; Gu, G.*; Kakurai, Kazuhisa; Matsuda, Masaaki; Takeda, Masayasu; Tranquada, J. M.*; Yamada, Kazuyoshi*; Birgeneau, R. J.*; Frost, C. D.*
no journal, ,
To study effects of the stripe structure to the magnetic excitations in the high-
cuprates, we have performed polarized neutron scattering study on LaBaCuO and LaSrCuO. The former shows robust stripe order whereas the latter has only weak order of stripes. The former shows spin fluctuations which are confined in the CuO plane, correspondingly to the confinement of the ordered spins in the plane. The latter shows nearly isotropic spin fluctuations. These observations imply that the low-energy spin excitations are strongly affected by the stripe order, which is important to understand the origin of the universal magnetic dispersion in the high- cuprates.
SrCuOMatsuda, Masaaki; Fujita, Masaki*; Takeda, Masayasu; Yamada, Kazuyoshi*; Kakurai, Kazuhisa
no journal, ,
Polarized neutron scattering is an important tool to clarify the existence of chirality. Furthermore, it also gives useful information on magnetic anisotropy of the spin fluctuations in the diagonal incommensurate phase. We performed polarized neutron scattering experiments in lightly-doped La
Sr
CuO. The results showed that the chiral terms are almost negligible, indicating that there is no chirality or that the two chirality domains are equally populated. The diagonal terms originate from the magnetic anisotropy in the antiferromagnetically ordered phase. It was found that the spins lie almost in the CuO plane although a finite out-of-plane component was observed. It was also found that there exists a small anisotropy in the CuO plane and the spin component is larger along the b axis, suggesting the remnant of anisotropy in pure LaCuO.
Hiraka, Haruhiro*; Wakimoto, Shuichi; Takeda, Masayasu; Kakurai, Kazuhisa; Yamada, Kazuyoshi*
no journal, ,
Kajimoto, Ryoichi; Yokoo, Tetsuya*; Nakamura, Mitsutaka; Nakajima, Kenji; Inamura, Yasuhiro; Takahashi, Nobuaki; Maruyama, Ryuji; Soyama, Kazuhiko; Mizuno, Fumio; Shibata, Kaoru; et al.
no journal, ,
no abstracts in English
Kajimoto, Ryoichi; Yokoo, Tetsuya*; Nakamura, Mitsutaka; Nakajima, Kenji; Inamura, Yasuhiro; Takahashi, Nobuaki; Maruyama, Ryuji; Soyama, Kazuhiko; Mizuno, Fumio; Shibata, Kaoru; et al.
no journal, ,
no abstracts in English
He neutron spin filters, 3Sakaguchi, 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.
He spin filter techniqueSakaguchi, Yoshifumi; Oyama, Kenji*; Hiraka, Haruhiro*; Tsutsumi, Kenji*; Ino, Takashi*; Arimoto, Yasushi*; Takeda, Masayasu; Suzuki, Junichi; Yamada, Kazuyoshi*; Kakurai, Kazuhisa
no journal, ,
After the birth of a new neutron scattering facility, MLF at J-PARC, it is desired to establish the most suitable polarizing technique for the facility. In MLF the white neutron beam over the wide energy range is used and the use of He spin filter technique is the best one. However, the technological level in Japan is far below the world's top level. To realize the polarized neutron scattering experiments using He spin filters in MLF, it is necessary to make the experiments at a reactor neutron facility first and to establish the required technique. Therefore, we have performed polarized neutron experiments at HERMES in JRR-3. We used the monochromatized neutron beam with 1.82 
. We measured the flipping ratio at the 111 reflection of single-crystalline CuMnAl and the change was observed. The details of the experimental setup and the results will be reported.
He neutron spin filtersSakaguchi, 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
