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Journal Articles

Development of compact high field pulsed magnet system for new sample environment equipment at MLF in J-PARC

Watanabe, Masao; Nojiri, Hiroyuki*; Ito, Shinichi*; Kawamura, Seiko; Kihara, Takumi*; Masuda, Takatsugu*; Sahara, Takuro*; Soda, Minoru*; Takahashi, Ryuta

JPS Conference Proceedings (Internet), 25, p.011024_1 - 011024_5, 2019/03

Recently, neutron scattering experiments have been rapidly progressed under high magnetic field. In the J-PARC, proto-type compact pulse magnet system with the power supply, the coil and the sample stick has been developed. Basic specifications of the power supply are as follows; maximum charged voltage with capacitor is 2 kV, maximum current is 8 kA, repetition rate is a pulse per several minutes and pulse duration is several msec. Maximum magnetic field in the coil is more than 30 Tesla. The sample stick is designed for Orange-Cryostat. In this presentation, We report the details of the pulsed magnet system and the performance of it on neutron scattering experiments at MLF beam line (HRC).

Journal Articles

Spin model of O$$_{2}$$-based magnet in a nanoporous metal complex

Soda, Minoru*; Homma, Yuki*; Takamizawa, Satoshi*; Kawamura, Seiko; Nakajima, Kenji; Masuda, Takatsugu*

Journal of the Physical Society of Japan, 85(3), p.034717_1 - 034717_9, 2016/03

 Times Cited Count:1 Percentile:85.15(Physics, Multidisciplinary)

Inelastic neutron scattering experiments are performed on the nanoporous metal complex Cu-${{it trans}}$-1,4-cyclohexanedicarboxylic acid (Cu-CHD) adsorbing O$$_{2}$$ molecules to identify the spin model of the O$$_{2}$$-based magnet realized in the host complex. It is found that the magnetic excitations of Cu-CHDs adsorbing low- and high-concentration O$$_{2}$$ molecules are explained by different spin models, the former by spin dimers and the latter by spin trimers. By using the obtained parameters and by assuming that the levels of the group of the highest energy states are reduced because of the nonnegligible spin dependence of the molecular potential of oxygen, the magnetization curves are explained quantitatively.

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

Spin-nematic interaction in the multiferroic compound Ba$$_{2}$$CoGe$$_{2}$$O$$_{7}$$

Soda, Minoru*; Matsumoto, Masashige*; M$"a$nsson, M.*; Kawamura, Seiko; Nakajima, Kenji; Shiina, Ryosuke*; Masuda, Takatsugu*

Physical Review Letters, 112(12), p.127205_1 - 127205_5, 2014/03

 Times Cited Count:24 Percentile:18.16(Physics, Multidisciplinary)

We demonstrate the existence of the spin-nematic interactions in an easy-plane type antiferromagnet Ba$$_{2}$$CoGe$$_{2}$$O$$_{7}$$ by exploring the magnetic anisotropy and spin dynamics. The combination of neutron scattering and magnetic susceptibility measurements reveals that the origin of the in-plane anisotropy is an antiferro-type interaction of the spin-nematic operator. The relation between the nematic operator and the electric polarization in the ligand symmetry of this compound is presented. The introduction of the spinnematic interaction is useful to understand the physics of spin and electric dipole in multiferroic compounds.

Journal Articles

Quantitative analysis of cisplatin sensitivity of human esophageal squamous cancer cell lines using in-air micro-PIXE

Tanaka, Naritake*; Kimura, Hitoshi*; Faried, A.*; Sakai, Makoto*; Sano, Takaaki*; Inose, Takanori*; Soda, Makoto*; Okada, Koji*; Nakajima, Masanobu*; Miyazaki, Tatsuya*; et al.

Cancer Science, 101(6), p.1487 - 1492, 2010/06

 Times Cited Count:12 Percentile:64.65(Oncology)

We examined the intracellular localization of cisplatin, a key chemotherapeutic agent, in esophageal cancer cell lines and determined their sensitivity to cisplatin using in-air micro-PIXE. Two human esophageal squamous cell carcinoma (ESCC) cell lines, TE-2 and TE-13, were examined for their response to cisplatin using MTT assay, flow cytometry and DNA fragmentation assays. Real-time reverse transcription-polymerase chain reaction was also used to evaluate the mRNA expression of multidrug resistance protein 2 (MRP2) in both cell lines. Platinum localizations of intracellular and intranuclear were measured using in-air micro-PIXE. TE-2 cells were more sensitive to cisplatin than TE-13 cells. The results of this study suggest that in-air micro-PIXE could be a useful quantitative method for evaluating the cisplatin sensitivity of individual cells. Finally, we speculate that MRP2 in the cell membrane may play an important role in regulating cisplatin sensitivity of ESCC cells.

Journal Articles

Structural studies of pyrochlore-related spin-1/2 system Ag$$_{2}$$Cu$$_{2}$$O$$_{3}$$

Uematsu, Daisuke*; Soda, Minoru*; Kobayashi, Yoshiaki*; Sato, Masatoshi*; Igawa, Naoki; Kakurai, Kazuhisa

Journal of the Physical Society of Japan, 75(12), p.124601_1 - 124601_5, 2006/12

 Times Cited Count:0 Percentile:100(Physics, Multidisciplinary)

The close coupling of the crystal distortion to the magnetic ordering in Ag$$_{2}$$Cu$$_{2}$$O$$_{3}$$ at 70K has been found by X-ray and neutron diffraction analyses and magnetic measurements. The system has a pyrochlore-related structure with corner-sharing tetrahedra of Cu$$^{2+}$$ ions, in which the geometrical frustration is inherent. We report how the structural distortion releases the frustration, stabilizing the magnetic ordered state.

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

 Times Cited Count:11 Percentile:41.78(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.

Journal Articles

Magnetic structures and spin states of NdBaCo$$_{2}$$O$$_{5}$$

Soda, Minoru*; Yasui, Yukio*; Ito, Masafumi*; Iikubo, Satoshi*; Sato, Masatoshi*; Kakurai, Kazuhisa

Journal of the Physical Society of Japan, 73(2), p.464 - 468, 2004/02

 Times Cited Count:41 Percentile:17.76(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Effects of "stripes" on the magnetic excitation spectra of La$$_{1.48}$$Nd$$_{0.4}$$Sr$$_{0.12}$$CuO$$_{4}$$

Ito, Masafumi*; Yasui, Yukio*; Iikubo, Satoshi*; Soda, Minoru*; Sato, Masatoshi*; Kobayashi, Akito*; Kakurai, Kazuhisa

Journal of the Physical Society of Japan, 72(7), p.1627 - 1630, 2003/07

 Times Cited Count:9 Percentile:45.93(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Magnetic structures of high temperature phases of TbBaCo$$_{2}$$O$$_{5.5}$$

Soda, Minoru*; Yasui, Yukio*; Fujita, Toshiaki*; Miyashita, Takeshi*; Sato, Masatoshi*; Kakurai, Kazuhisa

Journal of the Physical Society of Japan, 72(7), p.1729 - 1734, 2003/07

 Times Cited Count:76 Percentile:8.84(Physics, Multidisciplinary)

no abstracts in English

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

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

The Superconductivity and magnetism of the hydrate of Na$$_{x}$$CoO$$_{2}$$

Moyoshi, Taketo*; Yokoi, Mai*; Soda, Minoru*; Yasui, Yukio*; Kobayashi, Yoshiaki*; Sato, Masatoshi*; Igawa, Naoki; Kakurai, Kazuhisa

no journal, , 

no abstracts in English

Oral presentation

Successive magnetic transitions and ${it H-T}$ phase diagrams of Kagom$'e$ staircase compound Co$$_{3}$$V$$_{2}$$O$$_{8}$$

Yasui, Yukio*; Kobayashi, Yusuke*; Moyoshi, Taketo*; Soda, Minoru*; Sato, Masatoshi*; Igawa, Naoki; Kakurai, Kazuhisa

no journal, , 

no abstracts in English

Oral presentation

The Evaluation of the radon dose of radioactivity in high-level radioactive waste geological disposal facility

Yoshizawa, Yuji*; Kai, Michiaki*; Okoshi, Minoru; Kato, Tomoko; Yamaguchi, Tetsuji; Sasaki, Takayuki*; Hattori, Takatoshi*; Miyazaki, Shinichiro*; Higuchi, Natsuko*; Tokonami, Shinji*; et al.

no journal, , 

no abstracts in English

Oral presentation

Study of complex magnetic structures in frustrated magnets by means of polarized neutrons

Kakurai, Kazuhisa; Wakimoto, Shuichi; Matsuda, Masaaki*; Ishiwata, Shintaro*; Okuyama, Daisuke*; Taguchi, Yasujiro*; Tokura, Yoshiki*; Nishi, Masakazu*; Nakajima, Taro*; Mitsuda, Setsuo*; et al.

no journal, , 

Oral presentation

Development of pulsed magnet system in J-PARC MLF

Watanabe, Masao; Nojiri, Hiroyuki*; Ito, Shinichi*; Kawamura, Seiko; Kihara, Takumi*; Masuda, Takatsugu*; Sahara, Takuro*; Soda, Minoru*; Takahashi, Ryuta

no journal, , 

Recently, neutron and radiation beam scattering experiments have been rapidly progressed under high magnetic field more than a few tens Tesla. In the J-PARC MLF, proto-type compact pulse magnet system has been developed for the user's request. The pulsed magnet system consist of (1) a capacitor bank power supply, (2) a small solenoid coil and (3) a cryostat-insert. The capacitor bank power supply is movable using casters in order to be used for each beam-line. Superconducting DC magnet up to 17 T has already developed for neutron scattering experiments, so we made the coil which generate higher magnetic fields up to 30 T. We developed a cryostat-insert for Orange-cryostat which has often been used in neutron experiments. In this presentation, we report measurement results of characteristics of the pulsed magnet system in high resolution chopper spectrometer (HRC).

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