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Journal Articles

Magnetic-ordering propagation vectors of terbium hexaboride revisited

Iwasa, Kazuaki*; Iga, Fumitoshi*; Moyoshi, Taketo*; Nakao, Akiko*; Ohara, Takashi

Journal of the Physical Society of Japan, 87(6), p.064705_1 - 064705_5, 2018/06

https://doi.org/10.7566/JPSJ.87.064705
 Times Cited Count：0 Percentile：0.00(Physics, Multidisciplinary)

Journal Articles

Neutron scattering study of yttrium iron garnet

Shamoto, Shinichi; Ito, Takashi; Onishi, Hiroaki; Yamauchi, Hiroki; Inamura, Yasuhiro; Matsuura, Masato*; Akatsu, Mitsuhiro*; Kodama, Katsuaki; Nakao, Akiko*; Moyoshi, Taketo*; et al.

Physical Review B, 97(5), p.054429_1 - 054429_9, 2018/02

https://doi.org/10.1103/PhysRevB.97.054429
 Times Cited Count：29 Percentile：71.23(Materials Science, Multidisciplinary)

Nuclear and magnetic structure and full magnon dispersions of yttrium iron garnet Y$$_3$$Fe$$_5$$O$$_{12}$$ have been studied by neutron scattering. The lowest-energy dispersion below 14 meV exhibits a quadratic dispersion as expected from ferromagnetic magnons. The imaginary part of $$q$$-integrated dynamical spin susceptibility $$chi$$"($$E$$) exhibits a square-root energy-dependence in the low energies. The magnon density of state is estimated from the $$chi$$"($$E$$) obtained on an absolute scale. The value is consistent with a single chirality mode for the magnon branch expected theoretically.

Journal Articles

Non-aqueous selective synthesis of orthosilicic acid and its oligomers

Igarashi, Masayasu*; Matsumoto, Tomohiro*; Yagihashi, Fujio*; Yamashita, Hiroshi*; Ohara, Takashi; Hanashima, Takayasu*; Nakao, Akiko*; Moyoshi, Taketo*; Sato, Kazuhiko*; Shimada, Shigeru*

Nature Communications (Internet), 8, p.140_1 - 140_8, 2017/07

https://doi.org/10.1038/s41467-017-00168-5
 Times Cited Count：42 Percentile：71.97(Multidisciplinary Sciences)

Journal Articles

SENJU; A New time-of-flight single-crystal neutron diffractometer at J-PARC

Ohara, Takashi; Kiyanagi, Ryoji; Oikawa, Kenichi; Kaneko, Koji; Kawasaki, Takuro; Tamura, Itaru; Nakao, Akiko*; Hanashima, Takayasu*; Munakata, Koji*; Moyoshi, Taketo*; et al.

Journal of Applied Crystallography, 49(1), p.120 - 127, 2016/02

https://doi.org/10.1107/S1600576715022943
 Times Cited Count：66 Percentile：96.37(Chemistry, Multidisciplinary)

Journal Articles

Current status of an extreme environment single crystal neutron diffractometer SENJU at J-PARC

Ohara, Takashi; Kiyanagi, Ryoji; Kaneko, Koji; Tamura, Itaru; Nakao, Akiko*; Hanashima, Takayasu*; Munakata, Koji*; Moyoshi, Taketo*; Kuroda, Tetsuya*; Oikawa, Kenichi; et al.

JPS Conference Proceedings (Internet), 8, p.036018_1 - 036018_6, 2015/09

https://doi.org/10.7566/JPSCP.8.036018

Journal Articles

Superconducting transition temperature and the thickness of CuO$$_{2}$$ planes of Na$$_{x}$$CoO$$_{2}$$$$cdot$$yH$$_{2}$$O

Moyoshi, Taketo*; Kobayashi, Yoshiaki*; Yasui, Yukio*; Sato, Masatoshi*; Kakurai, Kazuhisa

Solid State Sciences, 12(5), p.656 - 659, 2010/05

https://doi.org/10.1016/j.solidstatesciences.2008.09.016
 Times Cited Count：0 Percentile：0.00(Chemistry, Inorganic & Nuclear)

Journal Articles

Search for magnetic excitation spectra of Na$$_{x}$$CoO$$_{2}$$$$cdot$$$$_{y}$$D$$_{2}$$O; Neutron scattering

Moyoshi, Taketo*; Yasui, Yukio*; Soda, Minoru*; Kobayashi, Yoshiaki*; Sato, Masatoshi*; Kakurai, Kazuhisa

Journal of the Physical Society of Japan, 75(7), p.074705_1 - 074705_6, 2006/07

https://doi.org/10.1143/JPSJ.75.074705
 Times Cited Count：11 Percentile：55.13(Physics, Multidisciplinary)

Neutron scattering investigations on single crystal Na$$_{x}$$CoO$$_{2}$$ y(D$$_{2}$$O) have been carried out. Strong 2-D diffuse scattering due to the short-range ordered state of D$$_{2}$$O molecules are observed. Significant scattering has been also observed for phonons originating from the vibrations of the short-range ordered D$$_{2}$$O molecules. No firm evidence for the magnetic fluctuations has been found for the hydrated superconducting component Na$$_{x}$$CoO$$_{2}$$ y(D$$_{2}$$O), while the very weak intensity modulation observed in the scans along (1/2,1/2,l) suggests the existence of the antiferromagnetic fluctuations in the non-hydrated parts of the sample.

Oral presentation

Current status of extreme environment single crystal neutron diffractometer SENJU, and latest news from JRR-3

Kaneko, Koji; Ohara, Takashi; Kiyanagi, Ryoji; Kawasaki, Takuro; Oikawa, Kenichi; Tamura, Itaru; Yamauchi, Yasuhiro; Hanashima, Takayasu*; Moyoshi, Taketo*; Nakao, Akiko*; et al.

no journal, , 

Oral presentation

Single crystal neutron diffraction study of high neutron absorbing compound EuX$$_{4}$$ (X = Al, Ga)

Kawasaki, Takuro; Kaneko, Koji; Aso, Naofumi*; Nakamura, Ai*; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika*; Moyoshi, Taketo*; Nakao, Akiko*; Hanashima, Takayasu*; et al.

no journal, , 

no abstracts in English

Oral presentation

Magnetic and crystal structure of strong neutron absorber SmBaMn$$_{2}$$O$$_{6}$$

Kiyanagi, Ryoji; Yamada, Shigeki*; Aoki, Hiroshi*; Sagayama, Hajime*; Moyoshi, Taketo*; Nakao, Akiko*; Arima, Takahisa*

no journal, , 

Manganites represented as RE$$_{1-x}$$AE$$_{x}$$MnO$$_{3}$$ (Re = trivalent rare earth, AE = divalent alkaline earth) has drawn great attention because of their fascinating and variety of physical properties. SmBaMn$$_{2}$$O$$_{6}$$ is one kind with Sm and Ba ordered at A-site. This material exhibit a charge-orbital ordering at 380K, another charge-orbital ordering and an antiferromagnetic phase transition around 200K, and an anomaly was also observed at 10K in a magnetic susceptibility data. In order to clarify the detail of the phase transition around 200K and 10K, a single crystal of SmBaMn$$_{2}$$O$$_{6}$$ was measured on the single crystal diffractometer at J-PARC/MLF, SENJU. The measurement revealed the existence of magnetic superlattice reflections below 180K, which indicated the CE-type spin ordering pattern, which is most commonly seen in this type of materials. A careful measurement of the superlattice reflections clarified that the charge-orbital ordering occurred slightly above the antiferromagnetic phase transition temperature.

Oral presentation

Magnetic excitations of spin-gap system Na$$_{3}$$Cu$$_{2}$$SbO$$_{6}$$ with distorted honeycomb structure

Miura, Yoko*; Yasui, Yukio*; Moyoshi, Taketo*; Sato, Masatoshi*; Kakurai, Kazuhisa

no journal, , 

Magnetic excitation spectra of Na$$_{3}$$Cu$$_{2}$$SbO$$_{6}$$ with the distorted honeycomb lattice structure have been investigated by means of neutron inelastic scattering. The observed dispersion of the magnetic excitation can be well understood in the framework of singlet-triplet excitation of quasi-one dimensional bond alternating system running in b-axis direction.

Oral presentation

Magnetic structures and multiferroic properties of LiCu$$_{2}$$O$$_{2}$$; Neutron scattering

Yasui, Yukio*; Sato, Kenji*; Moyoshi, Taketo*; Kobayashi, Yoshiaki*; Sato, Masatoshi*; Kakurai, Kazuhisa

no journal, , 

no abstracts in English

Oral presentation

SENJU, extreme environment single crystal neutron diffractometer at J-PARC

Ohara, Takashi; Kiyanagi, Ryoji; Kaneko, Koji; Kawasaki, Takuro; Oikawa, Kenichi; Tamura, Itaru; Nakao, Akiko*; Hanashima, Takayasu*; Munakata, Koji*; Moyoshi, Taketo*

no journal, , 

Oral presentation

Current status of a TOF-Laue single crystal neutron diffractometer SENJU

Ohara, Takashi; Kiyanagi, Ryoji; Nakao, Akiko*; Hanashima, Takayasu*; Munakata, Koji*; Moyoshi, Taketo*; Kuroda, Tetsuya*; Kaneko, Koji; Tamura, Itaru; Oikawa, Kenichi; et al.

no journal, , 

Oral presentation

Contrasting magnetic ground state in Eu$$X$$$$_{4}$$ ($$X$$=Al, Ga)

Kaneko, Koji; Kawasaki, Takuro; Nakamura, Ai*; Moyoshi, Taketo*; Munakata, Koji*; Nakao, Akiko*; Hanashima, Takayasu*; Kiyanagi, Ryoji; Ohara, Takashi; Oikawa, Kenichi; et al.

no journal, , 

no abstracts in English

Oral presentation

Ordering of frustrated spin systems coupled to lattice and charge degrees of freedom; Neutron scattering investigations

Kakurai, Kazuhisa; Matsuda, Masaaki; Ishii, Yoshinobu; Nagai, Satoshi*; Ikeda, Naoshi*; Kito, Hijiri*; Igawa, Naoki; Soda, Minoru*; Yasui, Yukio*; Moyoshi, Taketo*; et al.

no journal, , 

Two examples of neutron scattering investigations on the magnetic ordering process in frustrated spin system coupled to lattice and charge degrees of freedom are presented, in both cases leading to a short-ranged magnetic ground state. (1) In LuFe$$_{2}$$O$$_{4}$$ the Fe ions are arranged to form hexagonal double layers along the rhombohedral unique axis. Detailed investigation of the ordering process revealed a magnetic ground state with short-range order along the stacking direction. (2) YBaCo$$_{4}$$O$$_{7}$$ has a structure with alternating stacking of a kagome-like and triangular lattice formed of CoO$$_{4}$$ tetrahedra. Although the Co moments do not exhibit a long range ordering down to 10K, strong diffuse scattering due to the short-range ordering of the moments on the kagome-like and triangular lattices are observed.

Oral presentation

Magnetic phase transition and magnetic structures in SmBaMn$$_{2}$$O$$_{6}$$

Kiyanagi, Ryoji; Yamada, Shigeki*; Aoki, Hiroshi*; Sagayama, Hajime*; Moyoshi, Taketo*; Nakao, Akiko*; Arima, Takahisa*

no journal, , 

Manganites with perovskite-type structure have been attracted much attention because of their variety of orders and properties due to the competition between charges, orbitals and spins. The materials represented as ReBaMn$$_{2}$$O$$_{6}$$ forms in an A-site ordered double perovskite structure and exhibit complicated phase diagrams depending on the kind of atoms of Re. In the case of Re = Sm, the material shows two charge-orbital orders and two anomalies in magnetic susceptibility, but the details have not been clarified. In this study, the magnetic structure in the antiferromagnetic phase and the relation between the charge-orbital order and the antiferromagnetic phase were investigated by means of neutron magnetic scattering. The measurements were performed on the single crystal neutron diffractometer, SENJU, at J-PARC/MLF. The diffraction pattern revealed magnetic reflections arising from the antiferromagnetic order, which is consistent with the charge-orbital ordering patterns. In addition, the anomaly at the lowest temperature was found due to the reorientation of the spin moments.

Oral presentation

Recent advances of a single crystal neutron diffractometer SENJU at J-PARC

Ohara, Takashi; Kiyanagi, Ryoji; Nakao, Akiko*; Munakata, Koji*; Moyoshi, Taketo*; Moriyama, Kentaro*; Hanashima, Takayasu*; Kuroda, Tetsuya*

no journal, , 

Oral presentation

The Short-range ordering of the D$$_{2}$$O molecules of deuterated Na$$_{x}$$xCoO$$_{2}$$; Neutron scattering

Moyoshi, Taketo*; Yasui, Yukio*; Soda, Minoru*; Sato, Masatoshi*; Kakurai, Kazuhisa

no journal, , 

no abstracts in English

Oral presentation

Study of 2-(2'-hydroxyphenyl)benzimidazole by single crystal neutron diffraction at SENJU

Ohara, Takashi; Kiyanagi, Ryoji; Hanashima, Takayasu*; Moyoshi, Taketo*; Nakao, Akiko*; Munakata, Koji*; Kuroda, Tetsuya*

no journal, , 

no abstracts in English

34 (Records 1-20 displayed on this page)