JOPSS - Search Results

Journal Articles

Concept for a cesium-free negative ion source based on microwave heating of a low work function granular material

Matsubara, Akihiro*; Kokubu, Yoko; Nishio, Kazuhisa*; Kimura, Kenji*; Kashimura, Keiichiro*; Shimada, Koji; Fujita, Natsuko

Nuclear Instruments and Methods in Physics Research B, 568, p.165863_1 - 165863_5, 2025/11

https://doi.org/10.1016/j.nimb.2025.165863

Times Cited Count：0 Percentile：0.00(Instruments & Instrumentation)

We propose a concept for a cesium-free negative ion source based on microwave heating of granular low work function materials, which allows for both safety and high efficiency. This negative ion source features a structure where the plasma region and the negative ion generation region are adjacent within a microwave cavity. In the negative ion generation region, granular low work function materials heated by microwaves are placed. The sample gas entering the plasma region is excited, then it enters the negative ion generation region. Subsequently, it comes into contact with the surface of the low work function material, changes into negative ions, and finally, is extracted by an electric field. One advantage of this negative ion source is that, by using low work function materials in granular form, the reactive area is more than ten times larger compared to conventional negative ion sources using low work function materials.

Journal Articles

Development of a compact $^{3}$ He neutron spin filter at J-PARC

Takahashi, Shingo; Kiyanagi, Ryoji; Okudaira, Takuya*; Takada, Shusuke*; Kobayashi, Ryuju; Okuizumi, Mao; Ino, Takashi*; Asai, Kanta*; Tsuchikawa, Yusuke; Oikawa, Kenichi; et al.

Nuclear Instruments and Methods in Physics Research A, 1075, p.170410_1 - 170410_8, 2025/06

https://doi.org/10.1016/j.nima.2025.170410

Times Cited Count：3 Percentile：70.29(Instruments & Instrumentation)

Journal Articles

Observation of magnon polarization

Nambu, Yusuke*; Barker, J.*; Okino, Yuki*; Kikkawa, Takashi*; Shiomi, Yuki*; Enderle, M.*; Weber, T.*; Winn, B.*; Graves-Brook, M.*; Tranquada, J. M.*; et al.

Physical Review Letters, 125(2), p.027201_1 - 027201_6, 2020/07

https://doi.org/10.1103/PhysRevLett.125.027201

Times Cited Count：85 Percentile：95.25(Physics, Multidisciplinary)

Journal Articles

Anisotropic spin freezing in lightly-doped La $_{2-x}$ SrCuO

Matsuda, Masaaki; Fujita, Masaki*; Takeda, Masayasu; Kakurai, Kazuhisa; Yamada, Kazuyoshi*

Physica C, 470(Suppl.1), p.S82 - S83, 2010/12

https://doi.org/10.1016/j.physc.2009.11.009

Times Cited Count：1 Percentile：5.72(Physics, Applied)

Journal Articles

Charge excitations in the stripe-ordered La $_{5/3}$ Sr $_{1/3}$ NiO $_{4}$ and La $_{2-x}$ (Ba,Sr) $_{x}$ CuO $_{4}$ superconducting compounds

Wakimoto, Shuichi; Kimura, Hiroyuki*; Ishii, Kenji; Ikeuchi, Kazuhiko; Adachi, Tadashi*; Fujita, Masaki*; Kakurai, Kazuhisa; Koike, Yoji*; Mizuki, Junichiro; Noda, Yukio*; et al.

Physical Review Letters, 102(15), p.157001_1 - 157001_4, 2009/04

https://doi.org/10.1103/PhysRevLett.102.157001

Times Cited Count：25 Percentile：73.36(Physics, Multidisciplinary)

Journal Articles

Magnetic excitations from the linear Heisenberg antiferromagnetic spin trimer system ACu(PO) (A=Ca, Sr, and Pb)

Matsuda, Masaaki; Kakurai, Kazuhisa; Belik, A. A.*; Azuma, Masaki*; Takano, Mikio*; Fujita, Masaki*

Physical Review B, 71(14), p.144411_1 - 144411_5, 2005/04

https://doi.org/10.1103/PhysRevB.71.144411

Times Cited Count：41 Percentile：77.34(Materials Science, Multidisciplinary)

Inelastic neutron scattering experiments were performed on ACu(PO) (A=Ca, Sr, and Pb), which consists of one-dimensional array of linear copper spin trimers. It was found that the magnetic excitations are well described by the linear Heisenberg antiferromagnetic spin trimer model without adjustable parameters except the overall scale factor. The intra-trimer coupling contants are determined to be 9.39(4), 9.99(4), and 9.07(4) meV for ACu(PO) with A=Ca, Sr, and Pb, respectively.

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

https://doi.org/10.1143/JPSJ.72.1729

Times Cited Count：76 Percentile：89.71(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Temporal evolution of temperature and density profiles of a laser compressed core

Ochi, Yoshihiro; Golovkin, I.*; Mancini, R.*; Uschmann, I.*; Sunahara, Atsushi*; Nishimura, Hiroaki*; Fujita, Kazuhisa*; Louis, S.*; Nakai, Mitsuo*; Shiraga, Hiroyuki*; et al.

Review of Scientific Instruments, 74(3), p.1683 - 1687, 2003/03

https://doi.org/10.1063/1.1534389

Times Cited Count：10 Percentile：48.11(Instruments & Instrumentation)

no abstracts in English

Oral presentation

Spin fluctuation and its anisotropy in La $_{2-x}$ (Sr,Ba) $_{x}$ CuO $_{4}$

Wakimoto, Shuichi; Fujita, Masaki*; Gu, G.*; Kakurai, Kazuhisa; Matsuda, Masaaki; Takeda, Masayasu; Tranquada, J. M.*; Yamada, Kazuyoshi*; Birgeneau, R. J.*; Frost, C. D.*

no journal, ,

To study effects of the stripe structure to the magnetic excitations in the high- cuprates, we have performed polarized neutron scattering study on La $_{1.875}$ Ba $_{0.125}$ CuO $_{4}$ and La $_{1.92}$ Sr $_{0.08}$ CuO $_{4}$ . The former shows robust stripe order whereas the latter has only weak order of stripes. The former shows spin fluctuations which are confined in the CuO plane, correspondingly to the confinement of the ordered spins in the plane. The latter shows nearly isotropic spin fluctuations. These observations imply that the low-energy spin excitations are strongly affected by the stripe order, which is important to understand the origin of the universal magnetic dispersion in the high- cuprates.

Oral presentation

Imaging of Li distribution in Li ion batteries by direct elemental detection technique of PIGE and NRA combined with proton microbeam at TIARA

Yamazaki, Akiyoshi*; Kamiya, Tomihiro; Sato, Takahiro; Mima, Kunioki*; Fujita, Kazuhisa*; Okuda, Chikaaki*; Sawada, Hiroshi*; Saito, Tsohiya*; Gonzales, R.*; Perlado, J. M.*; et al.

no journal, ,

Oral presentation

Mesoscopic Li distribution analysis on an all solid battery

Saito, Tsohiya*; Yamazaki, Akiyoshi*; Kamiya, Tomihiro; Fujita, Kazuhisa*; Mima, Kunioki*; Kato, Yoshiaki*; Iba, Hideki*

no journal, ,

Oral presentation

Polarized neutron scattering study of spin dynamics in La $_{2-x}$ (Sr,Ba) $_{x}$ CuO $_{4}$

Wakimoto, Shuichi; Kakurai, Kazuhisa; Matsuda, Masaaki; Takeda, Masayasu; Fujita, Masaki*; Yamada, Kazuyoshi*; Gu, G.*; Tranquada, J. M.*; Birgeneau, R. J.*; Zhang, H.*

no journal, ,

Polarized neutron scattering exaperiments have been performed on La $_{1.875}$ Ba $_{0.125}$ CuO $_{4}$ and La $_{1.92}$ Sr $_{0.08}$ CuO $_{4}$ with intent to elucidate a possible effects of stripe structure to the spin dynamics. Low energy ( meV) data demonstratre that in the former sample, which has a well-ordered stripe state with Cu spins lying in the CuO plane at 10 K, spins fluctuate only in the plane. On the other hand, the latter sample, which has very weak stripe order, shows isotropic spin fluctuation. This implies that low energy magnetic excitations are stringly affected by the stripe order.

Oral presentation

Anisotropic spin freezing in lightly-doped La $_{2-x}$ SrCuO

Matsuda, Masaaki; Fujita, Masaki*; Takeda, Masayasu; Yamada, Kazuyoshi*; Kakurai, Kazuhisa

no journal, ,

Polarized neutron scattering is an important tool to clarify the existence of chirality. Furthermore, it also gives useful information on magnetic anisotropy of the spin fluctuations in the diagonal incommensurate phase. We performed polarized neutron scattering experiments in lightly-doped La $_{1.982}$ Sr $_{0.018}$ CuO. The results showed that the chiral terms are almost negligible, indicating that there is no chirality or that the two chirality domains are equally populated. The diagonal terms originate from the magnetic anisotropy in the antiferromagnetically ordered phase. It was found that the spins lie almost in the CuO plane although a finite out-of-plane component was observed. It was also found that there exists a small anisotropy in the CuO plane and the spin component is larger along the b axis, suggesting the remnant of anisotropy in pure LaCuO.

Oral presentation

Resonant inelastic X-ray scattering study of stripe-ordered La $_{2-x}$ Sr $_{x}$ NiO $_{4}$ and La $_{2-x}$ Ba $_{x}$ CuO $_{4}$

Wakimoto, Shuichi; Ishii, Kenji; Ikeuchi, Kazuhiko; Kakurai, Kazuhisa; Mizuki, Junichiro; Kimura, Hiroyuki*; Noda, Yukio*; Adachi, Tadashi*; Koike, Yoji*; Fujita, Masaki*; et al.

no journal, ,

no abstracts in English

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Concept for a cesium-free negative ion source based on microwave heating of a low work function granular material

Development of a compact $^{3}$ He neutron spin filter at J-PARC

Observation of magnon polarization

Anisotropic spin freezing in lightly-doped La $_{2-x}$ SrCuO

Charge excitations in the stripe-ordered La $_{5/3}$ Sr $_{1/3}$ NiO $_{4}$ and La $_{2-x}$ (Ba,Sr) $_{x}$ CuO $_{4}$ superconducting compounds

Magnetic excitations from the linear Heisenberg antiferromagnetic spin trimer system ACu(PO) (A=Ca, Sr, and Pb)

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

Temporal evolution of temperature and density profiles of a laser compressed core

Spin fluctuation and its anisotropy in La $_{2-x}$ (Sr,Ba) $_{x}$ CuO $_{4}$

Imaging of Li distribution in Li ion batteries by direct elemental detection technique of PIGE and NRA combined with proton microbeam at TIARA

Mesoscopic Li distribution analysis on an all solid battery

Polarized neutron scattering study of spin dynamics in La $_{2-x}$ (Sr,Ba) $_{x}$ CuO $_{4}$

Anisotropic spin freezing in lightly-doped La $_{2-x}$ SrCuO

Resonant inelastic X-ray scattering study of stripe-ordered La $_{2-x}$ Sr $_{x}$ NiO $_{4}$ and La $_{2-x}$ Ba $_{x}$ CuO $_{4}$