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Journal Articles

Maximizing $$T_c$$ by tuning nematicity and magnetism in FeSe$$_{1-x}$$S$$_x$$ superconductors

Matsuura, Kohei*; Mizukami, Yuta*; Arai, Yuki*; Sugimura, Yuichi*; Maejima, Naoyuki*; Machida, Akihiko*; Watanuki, Tetsu*; Fukuda, Tatsuo; Yajima, Takeshi*; Hiroi, Zenji*; et al.

Nature Communications (Internet), 8, p.1143_1 - 1143_6, 2017/10

https://doi.org/10.1038/s41467-017-01277-x
 Times Cited Count：80 Percentile：91.57(Multidisciplinary Sciences)

Journal Articles

Structural and functional characterization of the ${it Geobacillus}$ copper nitrite reductase; Involvement of the unique N-terminal region in the interprotein electron transfer with its redox partner

Fukuda, Yota*; Koteishi, Hiroyasu*; Yoneda, Ryohei*; Tamada, Taro; Takami, Hideto*; Inoue, Tsuyoshi*; Nojiri, Masaki

Biochimica et Biophysica Acta; Bioenergetics, 1837(3), p.396 - 405, 2014/03

https://doi.org/10.1016/j.bbabio.2014.01.004
 Times Cited Count：15 Percentile：47.19(Biochemistry & Molecular Biology)

The crystal structures of copper-containing nitrite reductase (CuNiR) from the thermophilic Gram-positive bacterium ${it Geobacillus kaustophilus}$ HTA426 and the amino (N)-terminal 68 residue-deleted mutant were determined at resolutions of 1.3${AA}$ and 1.8${AA}$, respectively. Both structures show a striking resemblance with the overall structure of the well-known CuNiRs composed of two Greek key $$beta$$-barrel domains; however, a remarkable structural difference was found in the N-terminal region. The unique region has one $$beta$$-strand and one $$alpha$$-helix extended to the northern surface of the type-1 copper site. The superposition of the ${it Geobacillus}$ CuNiR model on the electron-transfer complex structure of CuNiR with the redox partner cytochrome ${it c$_{551}$}$ in other denitrifier system led us to infer that this region contributes to the transient binding with the partner protein during the interprotein electron transfer reaction in the ${it Geobacillus}$ system. Furthermore, electron-transfer kinetics experiments using N-terminal residue-deleted mutant and the redox partner, ${it Geobacillus}$ cytochrome ${it c$_{551}$}$, were carried out. These structural and kinetics studies demonstrate that that region is directly involved in the specific partner recognition.

Journal Articles

Magnetic properties of R$$_{2}$$Fe$$_{3}$$O$$_{7}$$ (R=Yb and Lu)

Yoshii, Kenji; Ikeda, Naoshi*; Fukuyama, Ryota*; Nagata, Tomoko*; Kambe, Takashi*; Yoneda, Yasuhiro; Fukuda, Tatsuo; Mori, Shigeo*

Solid State Communications, 173, p.34 - 37, 2013/11

https://doi.org/10.1016/j.ssc.2013.08.030
 Times Cited Count：4 Percentile：20.56(Physics, Condensed Matter)

We have investigated the magnetic properties of R$$_{2}$$Fe$$_{3}$$O$$_{7}$$ (R=Yb and Lu), which belongs to the homologous family of electronic ferroelectric RFe$$_{2}$$O$$_{4}$$. Magnetization measurements show ferrimagnetic ordering at the Neel temperature (T$$_{N}$$) of about 270 K, which is slightly higher than that of RFe$$_{2}$$O$$_{4}$$ (T$$_{N}$$ about 230-250 K). Observation of spin glass and exchange bias shows a coexistence of ferromagnetic and antiferromagneticinteractions, similarly to RFe$$_{2}$$O$$_{4}$$. This situation gives rise to a complex magnetic change and a broad peak of magnetic entropy change. Some characteristics, such as refrigeration temperatures higher than in RFe$$_{2}$$O$$_{4}$$, seem to offer a possibility of this system to applications.

Journal Articles

Soft phonon mode coupled with antiferromagnetic order in incipient-ferroelectric Mott insulators Sr$$_{1-x}$$Ba$$_x$$MnO$$_3$$

Sakai, Hideaki*; Fujioka, Jun*; Fukuda, Tatsuo; Bahramy, M. S.*; Okuyama, Daisuke*; Arita, Ryotaro*; Arima, Takahisa*; Baron, A. Q. R.*; Taguchi, Yasujiro*; Tokura, Yoshinori*

Physical Review B, 86(10), p.104407_1 - 104407_11, 2012/09

https://doi.org/10.1103/PhysRevB.86.104407
 Times Cited Count：30 Percentile：74.69(Materials Science, Multidisciplinary)

Journal Articles

Cloning, expression, purification, crystallization and preliminary X-ray crystallographic study of GK0767, the copper-containing nitrite reductase from Geobacillus kaustophilus

Fukuda, Yota*; Tamada, Taro; Takami, Hideto*; Suzuki, Shinichiro*; Inoue, Tsuyoshi*; Nojiri, Masaki

Acta Crystallographica Section F, 67(6), p.692 - 695, 2011/06

https://doi.org/10.1107/S1744309111013297
 Times Cited Count：9 Percentile：67.71(Biochemical Research Methods)

Journal Articles

Stress and temperature dependence of the structure of the martensite and X-phase in Ni$$_{2}$$MnGa

Fukuda, Takashi*; Terai, Tomoyuki*; Kushida, Hiroaki*; Kakeshita, Tomoyuki*; Osakabe, Toyotaka; Kakurai, Kazuhisa

Philosophical Magazine, 90(14), p.1925 - 1935, 2010/05

https://doi.org/10.1080/14786430903571479
 Times Cited Count：6 Percentile：37.1(Materials Science, Multidisciplinary)

The stress and temperature dependence of the structure of the X-phase in Ni$$_{2}$$MnGa has been investigated by neutron diffraction measurements under compressive stress to clarify the structural relationship among the P-, I-, M- and X-phases. The structure of the X-phase in Ni$$_{2}$$MnGa depends strongly on stress and temperature compared to the M- or I-phase. In association with the X $$rightarrow$$ M transformation, both the position and intensity of the satellite reflection changes drastically, regardless of stress and temperature, while with X $$rightarrow$$ P transformation, the intensity of the satellite reflection fades gradually. For the I $$rightarrow$$ X transformation, the position and intensity of the satellite changes drastically when transformation occur under compressive stress, while the changes are continuous under zero stress. These results strongly suggest the existence of a multicritical point in Ni$$_{2}$$MnGa.

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

http://accelconf.web.cern.ch/AccelConf/IPAC10/papers/tupe091.pdf

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.

Journal Articles

Structural relation between the X-phase and other phases in Ni$$_{2}$$MnGa

Kakeshita, Tomoyuki*; Fukuda, Takashi*; Terai, Tomoyuki*; Osakabe, Toyotaka; Kakurai, Kazuhisa

Materials Science Forum, 635, p.49 - 54, 2009/12

We have investigated stress and temperature dependences of the structure of the X-phase in Ni$$_{2}$$MnGa to understand structural relation between the X-phase and other phases. We found that the structure change associated with the transformation from the intermediate (I-) phase to the X-phase is discontinuous under a compressive stress, while it is continuous under zero stress. In addition, the transformation from the X-phase to the L2$$_{1}$$-type parent phase is continuous regardless of applied stress. These results strongly suggest the existence of multi-critical point in Ni$$_{2}$$MnGa.

Journal Articles

Incommensurate structures of intermediate phase and martensite phase in Ni$$_{2}$$MnGa

Kushida, Hiroaki*; Fukuda, Kodai*; Terai, Tomoyuki*; Fukuda, Takashi*; Kakeshita, Tomoyuki*; Oba, Takuya*; Osakabe, Toyotaka; Kakurai, Kazuhisa; Kato, Kenichi*

Journal of Physics; Conference Series, 165, p.012054_1 - 012054_4, 2009/06

https://doi.org/10.1088/1742-6596/165/1/012054

Journal Articles

Neutron diffraction study on stress-induced X-phase in Ni$$_{2}$$MnGa

Kushida, Hiroaki*; Terai, Tomoyuki*; Fukuda, Takashi*; Kakeshita, Tomoyuki*; Osakabe, Toyotaka; Kakurai, Kazuhisa

Scripta Materialia, 60(4), p.248 - 250, 2009/02

https://doi.org/10.1016/j.scriptamat.2008.10.018
 Times Cited Count：8 Percentile：45.88(Nanoscience & Nanotechnology)

Journal Articles

Crystal structure of martensite and intermediate phases in Ni$$_{2}$$MnGa studied by neutron diffraction

Kushida, Hiroaki*; Fukuda, Kodai*; Terai, Tomoyuki*; Fukuda, Takashi*; Kakeshita, Tomoyuki*; Oba, Takuya*; Osakabe, Toyotaka; Kakurai, Kazuhisa; Kato, Kenichi*

European Physical Journal; Special Topics, 158(1), p.87 - 92, 2008/05

https://doi.org/10.1140/epjst/e2008-00658-2
 Times Cited Count：22 Percentile：72.02(Physics, Multidisciplinary)

JAEA Reports

Irradiation experiments of the 13th-15th OGL-1 fuel assemblies

Hayashi, Kimio; Sawa, Kazuhiro; Shiratori, Tetsuo; Kikuchi, Hironobu; Fukuda, Kosaku; Kitajima, Toshio; Ito, Tadaharu; Waragai, Hyota

JAERI-Research 2000-001, p.116 - 0, 2000/01

JAERI-Research-2000-001.pdf:21.78MB

no abstracts in English

Journal Articles

Transport and loss of energetic ions in JT-60U

Tobita, Kenji; Nishitani, Takeo; Harano, Hideki*; Tani, Keiji; Isobe, Mitsutaka*; Fujita, Takaaki; Kusama, Yoshinori; G.A.Wurden*; Shirai, Hiroshi; Oikawa, Toshihiro; et al.

Fusion Energy 1996, Vol.1, p.497 - 505, 1997/00

no abstracts in English

Journal Articles

Second harmonic ICRF heating experiments in JT-60

Fujii, Tsuneyuki; Kimura, Haruyuki; Saigusa, Mikio; Akiba, Masato; Ando, Toshiro; ; Aoyagi, Tetsuo; ; Azumi, Masafumi; Fukuda, Takeshi; et al.

Plasma Physics and Controlled Nuclear Fusion Research 1988, Vol.1, p.605 - 610, 1989/00

no abstracts in English

Oral presentation

Neutron diffraction studies on the martensite phase and intermediate phase of Ni$$_{2}$$MnGa alloy crystal

Kushida, Hiroaki*; Fukuda, Kodai*; Terai, Tomoyuki*; Fukuda, Takashi*; Kakeshita, Tomoyuki*; Oba, Takuya*; Osakabe, Toyotaka; Kakurai, Kazuhisa

no journal, , 

no abstracts in English

Oral presentation

The 1.3 ${AA}$ structure of copper nitrite reductase from thermophilic denitrifer

Fukuda, Yota*; Tamada, Taro; Takami, Hideto*; Inoue, Tsuyoshi*; Nojiri, Masaki

no journal, , 

Denitrification is known as anaerobic respiration in which nitrogenous compounds (NO$$_{2}$$$$^{-}$$ or NO$$_{3}$$$$^{-}$$) are used as terminal electron acceptors. Copper-containing nitrite reductase (CuNIR) catalyzes the one electron reduction of nitrite to nitric oxide (NO), which is the key step in the denitrification pathway. Here, we report the structure analysis of CuNIR from thermophilic ${it Geobacillus kaustophilus}$ HTA426(${it Gk}$NIR) at 1.3 ${AA}$ resolution. ${it Gk}$NIR folds a homo-trimeric structure, having two copper binding sites per a monomeric unit as well as other CuNIRs. There are main characteristics of ${it Gk}$NIR in two loops (tower loop and extra loop regions) and the N-terminal region. The additional N-terminal $$alpha$$-helix is positioned in the vicinity of the tower loop. These characteristic structures found in ${it Gk}$NIR structure suggest evolutionary diversity of CuNIR and play a key role in functioning in the particular environment where ${it G. kaustophilus}$ inhabits.

Oral presentation

Magnetic properties of single crystalline Lu$$_{2}$$Fe$$_{3}$$O$$_{7}$$

Yoshii, Kenji; Ikeda, Naoshi*; Fukuyama, Ryota*; Nagata, Tomoko*; Kambe, Takashi*; Yoneda, Yasuhiro; Fukuda, Tatsuo; Mori, Shigeo*

no journal, , 

The rare-earth iron oxides R$$_{2}$$Fe$$_{3}$$O$$_{7}$$ (R=Yb and Lu) are materials closely related to a multiferroic system RFe$$_{2}$$O$$_{4}$$, which shows a new type of ferroelectiricy (i.e., electronic ferroelectiricy) at 330 K owing to real-space charge ordering of Fe ions. In this work, we have investigated detailed magnetic properties of a single crystalline LuFe$$_{3}$$O$$_{7}$$. It was found that this oxide shows the magnetic transition temperature of 270 K, which is higher than that of the corresponding RFe$$_{2}$$O$$_{4}$$ (LuFe$$_{2}$$O$$_{4}$$), 240-250 K. AC magnetic susceptibility measurements exhibited spin-glass behavior at around the magnetic transition temperature. In addition, exchange bias and magnetocaloric effect were observed at low temperatures, similarly to RFe$$_{2}$$O$$_{4}$$. These phenomena are explained in connection with several factors, such as a coexistence of ferromagnetic and antiferromagnetic interactions between Fe ions.

Oral presentation

Characterization of secondary waste generated by Fukushima Daiichi Nuclear Power Station accident, 4; Characteristics comparison of the existing and additional multiple radio-nuclides removal system slurry

Fukuda, Yuhei; Hinai, Hiroshi; Shibata, Atsuhiro; Nomura, Kazunori; Ikeda, Akira*; Obata, Masamichi*; Ichikawa, Masashi*; Takahashi, Ryota*; Hirayama, Fumio*

no journal, , 

no abstracts in English

Oral presentation

Characterization of secondary waste generated by Fukushima Daiichi Nuclear Power Station accident, 5; Analysis of carbonate slurry sampled from high integrity container

Fukuda, Yuhei; Arai, Yoichi; Hinai, Hiroshi; Nomura, Kazunori; Ikeda, Akira*; Obata, Masamichi*; Ichikawa, Masashi*; Takahashi, Ryota*; Hirayama, Fumio*

no journal, , 

no abstracts in English

Oral presentation

Preliminary evaluation of the fuel debris behavior below the RPV lower head boundary of 1F Unit-2

Bando, Yamato*; Sasaki, Ryotaro*; Fukuda, Takanari*; Yamaji, Akifumi*; Yamashita, Takuya

no journal, , 

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