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Journal Articles

Temperature dependence of spin excitations in the frustrated spin chain system CuGeO$$_3$$

Fujita, Masaki*; Frost, C. D.*; Bennington, S. M.*; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Mizuno, Fumio*; Ikeuchi, Kazuhiko*; Arai, Masatoshi

Journal of the Physical Society of Japan, 82(8), p.084708_1 - 084708_5, 2013/08

https://doi.org/10.7566/JPSJ.82.084708
 Times Cited Count：1 Percentile：11.04(Physics, Multidisciplinary)

Journal Articles

The Fermi chopper spectrometer 4SEASONS at J-PARC

Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Mizuno, Fumio; Nakajima, Kenji; Kawamura, Seiko; Yokoo, Tetsuya*; Nakatani, Takeshi; Maruyama, Ryuji; Soyama, Kazuhiko; et al.

Journal of the Physical Society of Japan, 80(Suppl.B), p.SB025_1 - SB025_6, 2011/01

https://doi.org/10.1143/JPSJS.80SB.SB025
 Times Cited Count：113 Percentile：94.61(Physics, Multidisciplinary)

Journal Articles

New technique for inelastic neutron scattering measurement demonstrated on the chopper spectrometer 4SEASONS at J-PARC

Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Mizuno, Fumio; Yokoo, Tetsuya*; Nakatani, Takeshi; Arai, Masatoshi; Fujita, Masaki*

Kotai Butsuri, 45(2), p.79 - 89, 2010/02

http://ci.nii.ac.jp/naid/40017025649

Inelastic neutron scattering measurement using multiple incident energies can drastically enhances the measurement efficiency. The article reviews the principle of this new technique and an example of the measurement using the chopper spectrometer 4SEASONS of the pulsed neutron experimental facility in Japan Proton Accelerator Research Complex (J-PARC).

Journal Articles

First demonstration of novel method for inelastic neutron scattering measurement utilizing multiple incident energies

Nakamura, Mitsutaka; Kajimoto, Ryoichi; Inamura, Yasuhiro; Mizuno, Fumio; Fujita, Masaki*; Yokoo, Tetsuya*; Arai, Masatoshi

Journal of the Physical Society of Japan, 78(9), p.093002_1 - 093002_4, 2009/09

https://doi.org/10.1143/JPSJ.78.093002
 Times Cited Count：121 Percentile：94.88(Physics, Multidisciplinary)

We succeeded in experimentally demonstrating that a series of two-dimensional maps of a dynamical structure factor in momentum-energy space with multiple incident energies can be simultaneously obtained by one measurement. This method reduces the dead time of time-of-flight measurement, and thus it markedly increases the measurement efficiency. Our achievement realized using the Fermi chopper spectrometer 4SEASONS in J-PARC is expected to open up new possibilities of inelastic neutron scattering measurements.

Oral presentation

The Magnetic structure study of 4$$f$$-115-system TbRhIn$$_5$$

Metoki, Naoto; Sugai, Takashi*; Mizuno, Fumio; Haga, Yoshinori; Hieu, N.*; Onuki, Yoshichika

no journal, , 

no abstracts in English

Oral presentation

NpIn$$_{3}$$ study by neutron scattering under magnetic field

Mizuno, Fumio; Sugai, Takashi; Kaneko, Koji; Metoki, Naoto; Haga, Yoshinori; Aoki, Dai*; Homma, Yoshiya*; Shiokawa, Yoshinobu*

no journal, , 

NpIn$$_{3}$$ has the AuCu$$_{3}$$-type cubic structure. The structure is the same as the pressure-induced superconductor CeIn$$_{3}$$. It was reported that NpIn$$_{3}$$ orders ferromagnetcally below T$$_{C}$$ = 14 K and antiferromagnetically at T$$_{N}$$ = 10 K, and a new field-induced phase (AF+FM) is found by the magnetization measurement. We reported the (0.5 0.5 0) and (0.5 0.5 1) magnetic reflections the last time. But we was not be able to determine the magnetic structure. This time, we study Q = (0.5 0.5 0) by the horizontal magnet. In the case of Q$$perp$$H, the magnetic peak is observed, while in the case of Q$$||$$H, the magnetic peak is not observed. Using the relation of Q $$ propto$$ sin$$^{2}$$$$alpha$$, where $$alpha$$ is the angle between Q and a magnetic moment, we find that antiferromagnetic modulation component and the external field are parallel. That is, we come to a conclusion that the structure in which the magnetic moments expand and contract along the external field is stable.

Oral presentation

Magnetic form factor study of NpFeGa$$_5$$ by neutron scattering

Sugai, Takashi; Mizuno, Fumio; Jonen, Shintaro*; Kaneko, Koji; Metoki, Naoto; Haga, Yoshinori; Aoki, Dai*; Homma, Yoshiya*; Shiokawa, Yoshinobu*

no journal, , 

Np-115 compounds show various magenetic structures by changing the transision metal. NpFeGa$$_5$$ is the antiferromagnet which orders Q=(1/2 1/2 0) with two steps. Additionally NpFeGa$$_5$$ has the magnetic moment not only on Np site but also on Fe site. By analyzing the magnetic form factor, we obtained that it was possible for Fe to have the orbital magnetic moment. It is interesting because ordinarily the orbital magnetic moment of Fe is quenched.

Oral presentation

The Magnetic phase diagram and field induced ordered phase in NpIn$$_3$$

Metoki, Naoto; Kaneko, Koji; Haga, Yoshinori; Mizuno, Fumio; Sugai, Takashi; Aoki, Dai*; Homma, Yoshiya*; Shiokawa, Yoshinobu

no journal, , 

no abstracts in English

Oral presentation

The Neutron scattering study of NpIn$$_{3}$$ under magnetic fields

Mizuno, Fumio; Sugai, Takashi; Metoki, Naoto; Haga, Yoshinori; Kaneko, Koji; Aoki, Dai*; Homma, Yoshiya*; Shiokawa, Yoshinobu*

no journal, , 

NpIn$$_{3}$$ crystalizes in the cubic AuCu$$_{3}$$-type structure similar to the pressure-induced superconductor CeIn$$_{3}$$ as well as PrPb$$_{3}$$ with the antiferroquadrupolar ground state. Previous magnetization and specific heat measurements revealed ferro- and antiferromagnetic orderings and a new field-induced ordered phase (AF+FM). We have determined the magnetic structure of AF+FM phase using the neutron scattering experiments under both longitudinal and transverse magnetic fields. Furthermore, a peculiar magnetic structure was found in AF+FM phase, where the antiferromagnetic moments align parallel to the applied magnetic field, by using polarized neutron scattering experiments.

Oral presentation

Ordered state study of NpFeGa$$_{5}$$ by neutron scattering

Sugai, Takashi; Mizuno, Fumio; Jonen, Shintaro*; Kaneko, Koji; Metoki, Naoto; Haga, Yoshinori; Aoki, Dai*; Homma, Yoshiya*; Shiokawa, Yoshinobu*

no journal, , 

no abstracts in English

Oral presentation

4SEASONS; A High-intensity chopper spectrometer for inelastic neutron scattering at J-PARC/MLF

Kajimoto, Ryoichi; Nakamura, Mitsutaka; Yokoo, Tetsuya*; Nakajima, Kenji; Inamura, Yasuhiro; Takahashi, Nobuaki; Maruyama, Ryuji; Soyama, Kazuhiko; Shibata, Kaoru; Suzuya, Kentaro; et al.

no journal, , 

4SEASONS is one of the neutron chopper spectrometers in J-PARC/MLF. It is intended to provide very high counting rate up to 300 meV neutron energy with medium resolution ($$Delta E/E_i sim 6$$% at $$E=0$$) to efficiently collect weak inelastic signals from novel spin and lattice dynamics especially in high-$$T_c$$ superconductors and related materials. To achieve this goal, the spectrometer equips advanced instrumental design such as an elliptic-shaped converging neutron guide coated with high-$$Q_c$$ ($$m=3$$-4) supermirror, long-length (2.5 m) $$^3$$He PSDs arranged cylindrically inside the vacuum scattering chamber. Furthermore, the spectrometer is ready for multi-incident-energy measurements by the repetition rate multiplication method with a special Fermi chopper, and polarization analysis with $$^3$$He spin filters. 4SEASONS is now under construction and will be ready to use in December 2008. In this paper, we show the design of 4SEASONS and current status of its construction.

Oral presentation

Current status of the chopper spectrometer 4SEASONS at MLF, J-PARC

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

Oral presentation

Chopper-type neutron inelastic spectrometer 4SEASONS at MLF, J-PARC

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

Oral presentation

Starting-up of the chopper spectrometer 4SEASONS in J-PARC

Kajimoto, Ryoichi; Nakamura, Mitsutaka; Yokoo, Tetsuya*; Inamura, Yasuhiro; Mizuno, Fumio; Nakajima, Kenji; Takahashi, Nobuaki; Kawamura, Seiko; Maruyama, Ryuji; Soyama, Kazuhiko; et al.

no journal, , 

no abstracts in English

Oral presentation

New method for inelastic neutron scattering demonstrated at J-PARC

Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Mizuno, Fumio; Fujita, Masaki*; Yokoo, Tetsuya*; Arai, Masatoshi

no journal, , 

no abstracts in English

Oral presentation

Magnetic form factor study of NpFeGa$$_5$$ by neutron diffraction

Jonen, Shintaro; Kaneko, Koji; Metoki, Naoto; Mizuno, Fumio*; Honda, Fuminori*; Aoki, Dai*; Homma, Yoshiya*; Yamamoto, Etsuji; Shiokawa, Yoshinobu*; Onuki, Yoshichika*

no journal, , 

no abstracts in English

Oral presentation

Starting-up of the chopper spectrometer 4SEASONS in J-PARC

Kajimoto, Ryoichi; Nakamura, Mitsutaka; Yokoo, Tetsuya*; Inamura, Yasuhiro; Mizuno, Fumio; Nakajima, Kenji; Takahashi, Nobuaki; Kawamura, Seiko; Maruyama, Ryuji; Soyama, Kazuhiko; et al.

no journal, , 

Oral presentation

First demonstration of multi-Ei measurement for inelastic neutron scattering

Nakamura, Mitsutaka; Kajimoto, Ryoichi; Inamura, Yasuhiro; Yokoo, Tetsuya*; Mizuno, Fumio; Fujita, Masaki*; Arai, Masatoshi

no journal, , 

We have demonstrated that a series of two-dimensional maps of a dynamical structure factor of one-dimensional antiferromagnet CuGeO$$_{3}$$ are simultaneously obtained by one measurement using the multiple incident energies. This method reduces the dead time of time-of-flight measurement, and thus, it markedly increases the measurement efficiency. Our achievement realized using the Fermi chopper spectrometer 4SEASONS in J-PARC is expected to open up new possibilities of inelastic neutron scattering measurements.

Oral presentation

The Fermi-chopper spectrometer 4SEASONS at J-PARC

Kajimoto, Ryoichi; Nakamura, Mitsutaka; Yokoo, Tetsuya*; Inamura, Yasuhiro; Mizuno, Fumio; Nakajima, Kenji; Takahashi, Nobuaki; Kawamura, Seiko; Maruyama, Ryuji; Soyama, Kazuhiko; et al.

no journal, , 

no abstracts in English

Oral presentation

Fermi-chopper neutron spectrometer 4SEASONS

Kajimoto, Ryoichi; Nakamura, Mitsutaka; Yokoo, Tetsuya*; Inamura, Yasuhiro; Mizuno, Fumio; Nakajima, Kenji; Takahashi, Nobuaki; Kawamura, Seiko; Maruyama, Ryuji; Soyama, Kazuhiko; et al.

no journal, , 

no abstracts in English

33 (Records 1-20 displayed on this page)