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Journal Articles

Finite-temperature properties of extended Nagaoka ferromagnetism; Ordering processes and precursor of a quantum phase transition between itinerant ferromagnetic and Mott antiferromagnetic states

Onishi, Hiroaki; Miyashita, Seiji*

Physical Review B, 106(13), p.134436_1 - 134436_13, 2022/10

https://doi.org/10.1103/PhysRevB.106.134436

Times Cited Count：0 Percentile：0(Materials Science, Multidisciplinary)

Journal Articles

Excitation and transport of bound magnon clusters in frustrated ferromagnetic chain

Onishi, Hiroaki

Journal of Physics; Conference Series, 2207, p.012045_1 - 012045_6, 2022/03

https://doi.org/10.1088/1742-6596/2207/1/012045

Journal Articles

Optical selection rules of the magnetic excitation in the = $frac{1}{2}$ one-dimensional Ising-like antiferromagnet BaCo $_{2}$ V $_{2}$ O $_{8}$

Kimura, Shojiro*; Onishi, Hiroaki; Okutani, Akira*; Akaki, Mitsuru*; Narumi, Yasuo*; Hagiwara, Masayuki*; Okunishi, Koichi*; Kindo, Koichi*; He, Z.*; Taniyama, Tomoyasu*; et al.

Physical Review B, 105(1), p.014417_1 - 014417_9, 2022/01

https://doi.org/10.1103/PhysRevB.105.014417

Times Cited Count：0 Percentile：0(Materials Science, Multidisciplinary)

Journal Articles

Spin excitations of the =1/2 one-dimensional Ising-like antiferromagnet BaCo $_{2}$ V $_{2}$ O $_{8}$ in transverse magnetic fields

Okutani, Akira*; Onishi, Hiroaki; Kimura, Shojiro*; Takeuchi, Tetsuya*; Kida, Takanori*; Mori, Michiyasu; Miyake, Atsushi*; Tokunaga, Masashi*; Kindo, Koichi*; Hagiwara, Masayuki*

Journal of the Physical Society of Japan, 90(4), p.044704_1 - 044704_9, 2021/04

https://doi.org/10.7566/JPSJ.90.044704

Times Cited Count：1 Percentile：23.97(Physics, Multidisciplinary)

Journal Articles

Magnetic excitations and transport properties in frustrated ferromagnetic chain

Onishi, Hiroaki

Journal of Magnetism and Magnetic Materials, 479, p.88 - 90, 2019/06

https://doi.org/10.1016/j.jmmm.2019.02.006

Times Cited Count：0 Percentile：0(Materials Science, Multidisciplinary)

Journal Articles

Electrochemical reaction mechanisms under various charge-discharge operating conditions for Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ in a lithium-ion battery

Konishi, Hiroaki*; Hirano, Tatsumi*; Takamatsu, Daiko*; Gunji, Akira*; Feng, X.*; Furutsuki, Sho*; Okumura, Takafumi*; Terada, Shohei*; Tamura, Kazuhisa

Journal of Solid State Chemistry, 262, p.294 - 300, 2018/06

https://doi.org/10.1016/j.jssc.2018.03.028

Times Cited Count：8 Percentile：49.21(Chemistry, Inorganic & Nuclear)

The potential in each state of charge (SOC) during charging of Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ is higher than that during discharging. To clarify the effect of chargedischarge operating conditions on the electrochemical reaction, Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ was charged and discharged under various charge-discharge operating ranges, and OCP, crystal structure, and oxidation states of the ransition metals were evaluated by electrochemical measurement, XRD, and XAFS. These results indicate that OCP, lattice parameters, and oxidation states of the transition metals of Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ in each SOC are not constant. The XRD results indicate that two phases, namely, LiNi $_{0.33}$ Mn $_{0.33}$ Co $_{0.33}$ O $_{2}$ -like and Li $_{2}$ MnO $_{3}$ -like, exist in Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ .

Journal Articles

Dynamical quadrupole structure factor of frustrated ferromagnetic chain

Onishi, Hiroaki

Physica B; Condensed Matter, 536, p.346 - 349, 2018/05

https://doi.org/10.1016/j.physb.2017.10.056

Times Cited Count：1 Percentile：5.84(Physics, Condensed Matter)

Journal Articles

Mechanisms responsible for two possible electrochemical reactions in Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ used for lithium ion batteries

Konishi, Hiroaki*; Hirano, Tatsumi*; Takamatsu, Daiko*; Gunji, Akira*; Feng, X.*; Furutsuki, Sho*; Okumura, Takafumi*; Terada, Shohei*; Tamura, Kazuhisa

Journal of Solid State Chemistry, 258, p.225 - 231, 2018/02

https://doi.org/10.1016/j.jssc.2017.10.024

Times Cited Count：8 Percentile：49.21(Chemistry, Inorganic & Nuclear)

Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ is known as one of the cathode electrode material for Li ion batteries and its structure during charge and discharge process was investigated using electrochemical method and X-ray diffraction. It was found that in the charge process the structure changes in the order of Li $_{2}$ MnO $_{3}$ , LiNi $_{0.33}$ Mn $_{0.33}$ Co $_{0.33}$ O $_{2}$ , and Li $_{2}$ MnO $_{3}$ . On the other hand, in the discharge process, the structure changes in the order of Li $_{2}$ MnO $_{3}$ and LiNi $_{0.33}$ Mn $_{0.33}$ Co $_{0.33}$ O $_{2}$ .

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：16 Percentile：66.12(Materials Science, Multidisciplinary)

Nuclear and magnetic structure and full magnon dispersions of yttrium iron garnet YFeO $_{12}$ 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 -integrated dynamical spin susceptibility "() exhibits a square-root energy-dependence in the low energies. The magnon density of state is estimated from the "() obtained on an absolute scale. The value is consistent with a single chirality mode for the magnon branch expected theoretically.

Journal Articles

Quantum phase transitions driven by rhombic-type single-ion anisotropy in the =1 Haldane chain

Tzeng, Y.-C.*; Onishi, Hiroaki; Okubo, Tsuyoshi*; Kao, Y.-J.*

Physical Review B, 96(6), p.060404_1 - 060404_7, 2017/08

https://doi.org/10.1103/PhysRevB.96.060404

Times Cited Count：20 Percentile：69.15(Materials Science, Multidisciplinary)

Journal Articles

Magnetic structure and dispersion relation of the =1/2 quasi-one-dimensional Ising-like antiferromagnet BaCo $_{2}$ V $_{2}$ O $_{8}$ in a transverse magnetic field

Matsuda, Masaaki*; Onishi, Hiroaki; Okutani, Akira*; Ma, J.*; Agrawal, H.*; Hong, T.*; Pajerowski, D. M.*; Copley, J. R. D.*; Okunishi, Koichi*; Mori, Michiyasu; et al.

Physical Review B, 96(2), p.024439_1 - 024439_8, 2017/07

https://doi.org/10.1103/PhysRevB.96.024439

Times Cited Count：11 Percentile：52.02(Materials Science, Multidisciplinary)

Journal Articles

Variational wavefunction for the periodic Anderson model with onsite correlation factors

Kubo, Katsunori; Onishi, Hiroaki

Journal of the Physical Society of Japan, 86(1), p.013701_1 - 013701_4, 2017/01

https://doi.org/10.7566/JPSJ.86.013701

Times Cited Count：2 Percentile：22.71(Physics, Multidisciplinary)

Journal Articles

Beam commissioning of the linac for iBNCT

Naito, Fujio*; Anami, Shozo*; Ikegami, Kiyoshi*; Uota, Masahiko*; Ouchi, Toshikatsu*; Onishi, Takahiro*; Oba, Toshiyuki*; Obina, Takashi*; Kawamura, Masato*; Kumada, Hiroaki*; et al.

Proceedings of 13th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1244 - 1246, 2016/11

http://www.pasj.jp/web_publish/pasj2016/proceedings/PDF/TUP1/TUP118.pdf

The proton linac installed in the Ibaraki Neutron Medical Research Center is used for production of the intense neutron flux for the Boron Neutron Capture Therapy (BNCT). The linac consists of the 3-MeV RFQ and the 8-MeV DTL. Design average beam current is 10mA. Target is made of Beryllium. First neutron production from the Beryllium target was observed at the end of 2015 with the low intensity beam as a demonstration. After the observation of neutron production, a lot of improvement s was carried out in order to increase the proton beam intensity for the real beam commissioning. The beam commissioning has been started on May 2016. The status of the commissioning is summarized in this report.

JAEA Reports

Studies on the reconstruction of the concept of rock mass around the tunnel; Japanese fiscal year, 2014 (Contract research)

Kojima, Keiji*; Onishi, Yuzo*; Aoki, Kenji*; Tochiyama, Osamu*; Nishigaki, Makoto*; Tosaka, Hiroyuki*; Yoshida, Hidekazu*; Murakami, Hiroaki; Sasao, Eiji

JAEA-Research 2015-017, 54 Pages, 2015/12

JAEA-Research-2015-017.pdf:17.3MB

This report is concerned with research to reconstruct more realistic near-field (NF) concept for the geological disposal of radioactive waste. This year is the final year of this committee activities. So we have carried out the summary on Re-thinking of NF concept and its technical basis. Cooperation between the study fields and combination of various science and technology and evaluation methods are one of the important technical bases of NF concept. In addition, since the "Great East Japan Earthquake 2011", the safety paradigm has shifted dramatically. In the reconstruction of realistic NF concept, it is necessary to analyze what security matters whether society has become unacceptable for geological disposal. Committee, we also exchange views on such matters and presented the direction of future research and development for geological disposal.

Journal Articles