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Journal Articles

Structural, magnetic, transport, and thermoelectric properties of the pseudobrookite AlTi$$_{2}$$O$$_{5}$$-Ti$$_{3}$$O$$_{5}$$ system

Takahama, Ryusei*; Ishii, Toi*; Indo, Daigo*; Arizono, Mitsutoshi*; Terakura, Chieko*; Tokura, Yoshinori*; Takeshita, Nao*; Noda, Masaaki*; Kuwahara, Hideki*; Saiki, Takuo*; et al.

Physical Review Materials (Internet), 4(7), p.074401_1 - 074401_11, 2020/07

 Times Cited Count:1 Percentile:20.84(Materials Science, Multidisciplinary)

Journal Articles

Schottky specific heat of the lightly Mn-substituted electron-doped SrTiO$$_3$$

Okuda, Tetsuji*; Kajimoto, Ryoichi; Noda, Masaaki*; Kuwahara, Hideki*

AIP Advances (Internet), 8(10), p.101339_1 - 101339_5, 2018/10

 Times Cited Count:0 Percentile:0(Nanoscience & Nanotechnology)

Journal Articles

Elastic and dynamical structural properties of La and Mn-doped SrTiO$$_{3}$$ studied by neutron scattering and their relation with thermal conductivities

Kajimoto, Ryoichi; Nakamura, Mitsutaka; Murai, Naoki; Shamoto, Shinichi; Honda, Takashi*; Ikeda, Kazutaka*; Otomo, Toshiya*; Hata, Hiroto*; Eto, Takahiro*; Noda, Masaaki*; et al.

Scientific Reports (Internet), 8(1), p.9651_1 - 9651_8, 2018/06

 Times Cited Count:4 Percentile:32.16(Multidisciplinary Sciences)

Journal Articles

Effects of Mn substitution on the thermoelectric properties and thermal excitations of the electron-doped perovskite Sr$$_{1-x}$$La$$_{x}$$TiO$$_{3}$$

Okuda, Tetsuji*; Hata, Hiroto*; Eto, Takahiro*; Sobaru, Shogo*; Oda, Ryosuke*; Kaji, Hiroki*; Nishina, Kosuke*; Kuwahara, Hideki*; Nakamura, Mitsutaka; Kajimoto, Ryoichi

Journal of the Physical Society of Japan, 85(9), p.094717_1 - 094717_6, 2016/09

 Times Cited Count:5 Percentile:41.12(Physics, Multidisciplinary)

Journal Articles

Science from the initial operation of HRC

Ito, Shinichi*; Yokoo, Tetsuya*; Masuda, Takatsugu*; Yoshizawa, Hideki*; Soda, Minoru*; Ikeda, Yoichi*; Ibuka, Soshi*; Kawana, Daichi*; Sato, Taku*; Nambu, Yusuke*; et al.

JPS Conference Proceedings (Internet), 8, p.034001_1 - 034001_6, 2015/09

Journal Articles

Effects of Mn substitution on the thermoelectric properties of the electron-doped perovskite Sr$$_{1-x}$$La$$_{x}$$TiO$$_{3}$$

Okuda, Tetsuji*; Hata, Hiroto*; Eto, Takahiro*; Nishina, Kosuke*; Kuwahara, Hideki*; Nakamura, Mitsutaka; Kajimoto, Ryoichi

Journal of Physics; Conference Series, 568(Part 2), p.022035_1 - 022035_5, 2014/12

Journal Articles

Recent progress in the energy recovery linac project in Japan

Sakanaka, Shogo*; Akemoto, Mitsuo*; Aoto, Tomohiro*; Arakawa, Dai*; Asaoka, Seiji*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; et al.

Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.2338 - 2340, 2010/05

Future synchrotron light source using a 5-GeV energy recovery linac (ERL) is under proposal by our Japanese collaboration team, and we are conducting R&D efforts for that. We are developing high-brightness DC photocathode guns, two types of cryomodules for both injector and main superconducting (SC) linacs, and 1.3 GHz high CW-power RF sources. We are also constructing the Compact ERL (cERL) for demonstrating the recirculation of low-emittance, high-current beams using above-mentioned critical technologies.

JAEA Reports

Study on a collapse mechanism of a junction between greatly deeper shaft and horizontal drifts (Contract research)

Kurosaki, Yukio*; Yamachi, Hiroshi*; Katsunuma, Yoshio*; Nakata, Masao*; Kuwahara, Hideki*; Yamada, Fumitaka*; Matsushita, Kiyoshi*; Sato, Toshinori*

JAEA-Research 2008-048, 274 Pages, 2008/03

JAEA-Research-2008-048.pdf:10.93MB

A junction space between a super deep shaft and horizontal drifts forms a 3-dimensional geo-structure, which would take a complicated mechanical behavior during a junction excavation. However, a quantitative design method for a deep junction has not yet established. In order to examine a collapse mechanism of super deep shaft junction, we have conducted literature surveys and interview studies concerned with a collapses. Considering the results of investigations with reviews of intellectuals, the collapse mechanism depends on both a construction procedure of shaft junction and a geological condition. On the other hand, where a deep junction intersects faults and/or fractures with a large angle, a collapse called taka-nuke may occur and a numerical studies that can simulate a practical rock mass behavior around a shaft junction should be carry out. We demonstrate finite difference method is most adequate for these simulations with intellectual review.

Journal Articles

Ferroelectric polarization and magnetic structure in Eu$$_{0.595}$$Y$$_{0.405}$$MnO$$_{3}$$

Kajimoto, Ryoichi; Yokoo, Tetsuya*; Kofu, Maiko*; Noda, Kohei*; Kuwahara, Hideki*

Journal of Physics and Chemistry of Solids, 68(11), p.2087 - 2090, 2007/11

 Times Cited Count:4 Percentile:23.93(Chemistry, Multidisciplinary)

Eu$$_{0.595}$$Y$$_{0.405}$$MnO$$_3$$ shows an antiferromagnetic transition below $$T_N = 47$$K. A spontaneous ferroelectric polarization $$P$$ along $$c$$ appears below $$T_C^c = 25$$K. The direction of $$P$$ then switches to $$a$$ below $$T_C^a = 23$$K. To investigate the relation between $$P$$ and the magnetic structure (MS), we have performed a neutron diffraction study using EXCED diffractometer installed at KENS spallation neutron facility of KEK. Magnetic Bragg peaks with a wave vector (0,0.31,1) were observed. By comparing a magnetic Bragg peak whose scattering vector $$bf{Q}$$ is almost parallel to $$b$$ and that with $$bf{Q}$$ almost parallel to $$c$$, we have succeeded in observing the change of the MS at the temperature ($$T$$) where $$P$$ appears and at $$T$$ where $$P$$ changes its polarization direction. Our observations can be interpreted as formation of a spiral spin structure and change of its easy plane in response to the change of the dielectric properties.

Journal Articles

Spin wave and orbital ordering in the C-type antiferromagnetic phase of Nd$$_{1-x}$$Sr$$_{x}$$MnO$$_{3}$$

Kajimoto, Ryoichi; Yoshizawa, Hideki*; Kawasaki, Ryuichi*; Noda, Kohei*; Kuwahara, Hideki*

Journal of the Physical Society of Japan, 74(1), p.502 - 503, 2005/01

 Times Cited Count:1 Percentile:12.06(Physics, Multidisciplinary)

The spin wave dispersion relation of the C-type antiferromagnetic structure in Nd$$_{0.25}$$Sr$$_{0.75}$$MnO$$_{3}$$ was determined by neutron scattering. The spin exchange interactions show a large anisotropy, which evidences the d$$_{3z^2-r^2}$$ orbital ordering along the $$c$$ axis. The exchange interaction along the $$c$$ direction is fairly large and similar to the value in the ferromagnetic metallic phase, suggesting there is finite hopping of charges along the orbital chains.

Oral presentation

Ferroelectric polarization and magnetic structure in Eu$$_{0.595}$$Y$$_{0.405}$$MnO$$_{3}$$

Kajimoto, Ryoichi; Yokoo, Tetsuya*; Kofu, Maiko*; Noda, Kohei*; Kuwahara, Hideki*

no journal, , 

no abstracts in English

Oral presentation

Ferroelectric polarization and magnetic structure in Eu$$_{0.595}$$Y$$_{0.405}$$MnO$$_{3}$$

Kajimoto, Ryoichi; Yokoo, Tetsuya*; Kofu, Maiko*; Noda, Kohei*; Kuwahara, Hideki*

no journal, , 

no abstracts in English

Oral presentation

Elastic and dynamical structural properties of La and Mn-doped SrTiO$$_{3}$$ studied by neutron scattering and their relation with thermal conductivities

Kajimoto, Ryoichi; Nakamura, Mitsutaka; Murai, Naoki; Shamoto, Shinichi; Honda, Takashi*; Ikeda, Kazutaka*; Otomo, Toshiya*; Hata, Hiroto*; Eto, Takahiro*; Noda, Masaaki*; et al.

no journal, , 

13 (Records 1-13 displayed on this page)
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