研究者詳細 - 木原　工

論文 - 木原　工

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A Review on the Magnetovolume Effect of the Full Heusler Alloys Ni2MnZ (Z = In, Sn, Sb) 査読

Takeshi Kanomata, Xiao Xu, Takuo Sakon, Yuki Nagata, Shin Imada, Toshihiro Omori, Ryosuke Kainuma, Tetsujiro Eto, Yoshiya Adachi, Takumi Kihara, Yasushi Amako, Masaaki Doi, Yoshiya Uwatoko

Metals 15 ( 2 ) 215 - 215 2025年2月

Magnetic structure and magnetoelectric properties of the spin-flop phase in LiFePO₄ 査読国際共著国際誌

Sofie Holm-Janas, Mitsuru Akaki, Ellen Fogh, Takumi Kihara, Manh Duc Le, Paola Catarina Forino, Stanislav E. Nikitin, Tom Fennell, Adheena Painganoor, David Vaknin, Masao Watanabe, Niels Bech Christensen, Hiroyuki Nojiri, Rasmus Toft-Petersen

Physical Review B 109 ( 17 ) 174413 2024年5月

Effects of Na deficiency on spin dynamics in the Mott insulating Na_4-xIr₃O₈ 査読国際共著国際誌

Y. S. Choi, C. H. Lee, T. Kihara, H. Zheng, H. Nojiri, J. F. Mitchell, Kwang-Yong Choi

Physical Review B 109 ( 14 ) 144405 2024年4月

Pressure Effect on the Magnetic Properties of the Heusler Alloy Co₂NbGa 査読国際誌

Yoshiya Adachi, Yuki Ogi, Tatsuji Osaki, Tetsujiro Eto, Takumi Kihara, Hironori Nishihara, Takuo Sakon, Jun Gouchi, Yoshiya Uwatoko, Takeshi Kanomata

Journal of Superconductivity and Novel Magnetism 2023年12月

Automated Pulsed Magnet System for Neutron Diffraction Experiments at the Materials and Life Science Experimental Facility in J-PARC 査読国際誌

Masao Watanabe, Takumi Kihara, Hiroyuki Nojiri

Quantum Beam Science 7 ( 1 ) 1 - 1 2022年12月

掲載種別：研究論文（学術雑誌）出版者・発行元：MDPI AG

A pulsed magnet system has been developed as a new user-friendly sample environment equipment at the Materials and Life Science Experimental Facility in Japan Proton Accelerator Research Complex. It comprises a vacuum chamber, a 4 K closed-cycle refrigerator for samples, and a nitrogen bath made of a stainless-steel tube with a miniature solenoidal coil. The coil is cooled by liquid nitrogen supplied by an automatic liquid nitrogen supply system, and the sample is cooled by a refrigerator. This combination facilitates the automatic high magnetic field diffraction measurement for the user’s operation. A relatively large scattering angle 2θ is up to 42°, which is significantly wider than the previous setup. Neutron diffraction experiments were performed on a multiferroic TbMnO3 and the field dependence of the diffraction peaks was clearly observed. The new pulsed magnet system was established for a practical high magnetic field diffraction for the user program.

DOI： 10.3390/qubs7010001

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Magnetically Hidden State on the Ground Floor of the Magnetic Devil’s Staircase 査読国際共著国際誌

S. Imajo, N. Matsuyama, T. Nomura, T. Kihara, S. Nakamura, C. Marcenat, T. Klein, G. Seyfarth, C. Zhong, H. Kageyama, K. Kindo, T. Momoi, Y. Kohama

Physical Review Letters 129 ( 14 ) 147201-1 - 147201-6 2022年9月

Characterization of photoinduced normal state through charge density wave in superconducting YBa₂Cu₃O_6.67 査読国際共著国際誌

H. Jang, S. Song, T. Kihara, Y. Liu, S. J. Lee, S. Y. Park, M. Kim, H. D. Kim, G. Coslovich, S. Nakata, Y. Kubota, I. Inoue, K. Tamasaku, M. Yabashi, H. Lee, C. Song, H. Nojiri, B. Keimer, C. C. Kao, J. S. Lee

8 ( 6 ) eabk0832-1 - eabk0832-7 2022年2月

High-field soft-x-ray dichroism of a hard ferrimagnet with easy-plane anisotropy 査読国際共著国際誌

Sh. Yamamoto, D. I. Gorbunov, I. F. Diaz-Ortega, A. Miyata, T. Kihara, Y. Kotani, T. Nakamura, N. V. Mushnikov, A. V. Andreev, H. Nojiri, J. Wosnitza

Physical Review B 104 ( 6 ) 064405 2021年8月

掲載種別：研究論文（学術雑誌）出版者・発行元：American Physical Society (APS)

We performed soft x-ray spectroscopic studies of the ferrimagnet TbFe5Al7 with strong easy-plane anisotropy in pulsed magnetic fields up to 29 T along with bulk magnetization and magnetostriction measurements. We observed pronounced amplitude changes of x-ray magnetic circular dichroism and x-ray absorption spectra at the field-induced magnetic transition. This microscopically evidences the simultaneous rotation of the Tb 4f and Fe 3d magnetic moments from a collinear ferrimagnetic order along the [100] axis to a state with the moments close to [010], the other easy-axis direction of the tetragonal lattice in magnetic fields applied along the [100] axis. We determined the magnetic-anisotropy constant of TbFe5Al7 by simulating the high-field macro- and microscopic magnetization process using a two-sublattice model.

DOI： 10.1103/physrevb.104.064405

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その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.104.064405/fulltext

Observation of inverse magnetocaloric effect in magnetic-field-induced austenite phase of Heusler alloys Ni50−xCoxMn31.5Ga18.5 (x=9 and 9.7) 査読

T. Kihara, T. Roy, X. Xu, A. Miyake, M. Tsujikawa, H. Mitamura, M. Tokunaga, Y. Adachi, T. Eto, T. Kanomata

Physical Review Materials 5 ( 3 ) 034416-1 - 034416-13 2021年3月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Physical Society (APS)

DOI： 10.1103/physrevmaterials.5.034416

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その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevMaterials.5.034416/fulltext

Element-specific field-induced spin reorientation and tetracritical point in MnCr2S4 査読

Sh. Yamamoto, H. Suwa, T. Kihara, T. Nomura, Y. Kotani, T. Nakamura, Y. Skourski, S. Zherlitsyn, L. Prodan, V. Tsurkan, H. Nojiri, A. Loidl, J. Wosnitza

Physical Review B 103 ( 2 ) L020408-1 - 6 2021年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Physical Society (APS)

The ferrimagnetic spinel MnCr2S4 shows a variety of magnetic-field-induced phase transitions owing to bond frustration and strong spin-lattice coupling. However, the site-resolved magnetic properties at the respective field-induced phases in high magnetic fields remain elusive. Our soft x-ray magnetic circular dichroism studies up to 40 T directly evidence element-selective magnetic-moment reorientations in the field-induced phases. The complex magnetic structures are further supported by entropy changes extracted from magnetocaloric-effect measurements. Moreover, thermodynamic experiments reveal an unusual tetracritical point in the H-T phase diagram of MnCr2S4 due to strong spin-lattice coupling.

DOI： 10.1103/physrevb.103.l020408

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その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.103.L020408/fulltext

Erratum: Capacitive detection of magnetostriction, dielectric constant, and magneto-caloric effects in pulsed magnetic fields (Review of Scientific Instruments (2020) 91 (105103) DOI: 10.1063/5.0010753)

Atsushi Miyake, Hiroyuki Mitamura, Shiro Kawachi, Kenta Kimura, Tsuyoshi Kimura, Takumi Kihara, Makoto Tachibana, Masashi Tokunaga

Review of Scientific Instruments 91 ( 11 ) 2020年11月

Capacitive detection of magnetostriction, dielectric constant, and magneto-caloric effects in pulsed magnetic fields 査読

Atsushi Miyake, Hiroyuki Mitamura, Shiro Kawachi, Kenta Kimura, Tsuyoshi Kimura, Takumi Kihara, Makoto Tachibana, Masashi Tokunaga

Review of Scientific Instruments 91 ( 10 ) 105103 - 105103 2020年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AIP Publishing

© 2020 Author(s). We report on the development of a capacitance measuring system that allows measurements of capacitance in pulsed magnetic fields up to 61 T. By using this system, magnetic-field responses of various physical quantities, such as magnetostriction, magnetic-field-induced change in complex dielectric constant, and magneto-caloric effect, can be investigated in pulsed-magnetic-field conditions. Here, we examine the validity of our system for investigations of these magnetic-field-induced phenomena in pulse magnets. For the magnetostriction measurement, magnetostriction of a specimen can be measured through a change in the capacitance between two aligned electrodes glued on the specimen and a dilatometer. We demonstrate a precise detection of valley polarization in semimetallic bismuth through a magnetostriction signal with a resolution better than 10-6 of the relative length change. For the magnetic-field-induced change in complex dielectric constant, we successfully observed clear dielectric anomalies accompanied by magnetic/magnetoelectric phase transitions in multiferroic Pb(TiO)Cu4(PO4)4. For the measurement of magneto-caloric effect, a magnetic-field-induced change in sample temperature was verified for Gd3Ga5O12 with a capacitance thermometer made of a non-magnetic ferroelectric compound KTa1-xNbxO3 (x = 0.02) whose capacitance is nearly field-independent. These results show that our capacitance measuring system is a promising tool to study various magnetic-field-induced phenomena, which have been difficult to detect in pulsed magnetic fields.

DOI： 10.1063/5.0010753

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Anisotropy of the Upper Critical Field in the Heavy-Fermion Superconductor UTe2 査読

Georg Knebel, Motoi Kimata, Michal Valiska, Fuminori Honda, Dexin Li, Daniel Braithwaite, Gerard Lapertot, William Knafo, Alexandre Pourret, Yoshiki J. Sato, Yusei Shimizu, Takumi Kihara, Jean-Pascal Brison, Jacques Flouquet, Dai Aoki

Journal of the Physical Society of Japan 85 ( 5 ) 053707 2020年4月

High-Field Magnetization and Magnetic Phase diagrams of Metamagnetic Shape Memory Alloys Ni50-xCoxMn31.5Ga18.5 (x = 9 and 9.7) 査読

T. Kihara, X. Xu, A. Miyake, Y. Kinoshita, M. Tokunaga, Y. adachi, and T. Kanomata

Scripta Materialia 181 25 - 29 2020年2月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD

Magnetic phase diagrams of the metamagnetic shape memory alloys Ni50-xCoxMn31.5Ga18.5 (x = 9 and 9.7) were produced from high-field magnetization measurements up to 56 T. For both compounds, magnetic field induced martensitic transformations are observed at various temperatures below 300 K. Hysteresis of the field-induced transformation shows unconventional temperature dependence: it decreases with decreasing temperature after showing a peak. Magnetic susceptibility measurement, microscopy, and X-ray diffraction data suggest a model incorporating the magnetic anisotropy and Zeeman energy in two variants, which qualitatively explains the thermal and the magnetic field history dependence of the hysteresis in these alloys. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.scriptamat.2020.02.009

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Magnetic properties of Ferromagnetic Heusler alloy Co2NbGa 査読

T. Kanomata, H. Nishihara, T. Osaki, M. Doi, T. Sakon, Y. Adachi, T. Kihara, and T. Shishido

Journal of Magnetism and Magnetic Materials 503 166604 2020年2月

Random Hopping Majorana Fermions in the Diluted Kitaev System alpha-Ru0.8Ir0.2Cl3 査読

Seung-Hwan Do, C. H. Lee, T. Kihara, Y. S. Choi, S. Yoon, K. Kim, H. Cheong, Wei-Tin Chen, F. Chou, H. Nojiri, and Kwang-Yong Choi

Physical Review Letters 124 047204 2020年1月

Magnetic structures and quadratic magnetoelectric effect in LiNiPO4 beyond 30 T 査読

E. Fogh, T. Kihara, R. Toft-Petersen, M. Bartkowiak, Y. Narumi, O. Prokhnenko, M. K. Sorensen, J. C. Dynnmu, D. Vaknin, H. Nojiri

Physical Review B 101 024403 2020年

Development of Compact High Field Pulsed Magnet System for New Sample Environment Equipment at MLF in J-PARC 査読

M. Watanabe, H. Nojiri, S. Itoh, S. Ohira-Kawamura, T. Kihara, T. Masuda, T. Sahara, M. Soda, R. Takahashi

Proceedings of the 3rd International Symposium of Quantum Beam Science at Ibaraki University "Quantum Beam Science in Biology and Soft Materials (ISQBSS2018)" 25 011024 2019年3月

Magnetoresistance and Thermal Transformation Arrest in Pd2Mn1.4Sn0.6 Heusler Alloys 査読

Xu, Xiao, Okada, Hironari, Chieda, Yusuke, Aizawa, Naoki, Takase, Daiki, Nishihara, Hironori, Sakon, Takuo, Han, Kwangsik, Ito, Tatsuya, Adachi, Yoshiya, Kihara, Takumi, Kainuma, Ryosuke, Kanomata, Takeshi

Materials 12 2308 2019年

Electron-Transfer Activity in a Cyanide-Bridged Fe₄₂ Nanomagnet 査読

Baker, Michael L., Wu, Shu-Qi, Kang, Soonchul, Matsuzawa, Satoshi, Arrio, Marie-Anne, Narumi, Yasuo, Kihara, Takumi, Nakamura, Tetsuya, Kotani, Yoshinori, Sato, Osamu, Nojiri, Hiroyuki

58 ( 15 ) 10160 - 10166 2019年

Evidence of low-energy singlet excited states in the spin-1/2 polyhedral clusters {Mo72V30} and {W72V30} with strongly frustrated kagome networks 査読

Kihara, T., Nojiri, H., Narumi, Y., Oshima, Y., Kindo, K., Heesing, C., Schnack, J., Mueller, A.

Physical Review B 99 064430 2019年

Time and Magnetic Field Variation of Magnetic Structure in a Triangular Magnet Ca3Co2O6 査読

K. Motoya, T. Kihara, H. Nojiri, Y. Uwatoko, M. Matsuda, T. Hong

Journal of the Physical Society of Japan 87 114703-1 - 11 2018年

Magnetic-field-induced transition for reentrant martensitic transformation in Co-Cr-Ga-Si shape memory alloys 査読

Xu Xiao, Kihara Takumi, Miyake Atsushi, Tokunaga Masashi, Kanomata Takeshi, Kainuma Ryosuke

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 466 273 - 276 2018年

Giant Exchange Coupling Evidenced with a Magnetization Jump at 52 T for a Gadlinium-Nitroxide Chelate 査読

T. Kanetomo, T. Kihara, A. Miyake, A. Matsuo, M. Tokunaga, K. Kindo, H. Nojiri, T. Ishida

Inorganic Chemistry 56 3310 - 3314 2017年

Chemical trend on the lanthanoide-radical exchange coupling 査読

T. Ishida, T. Nakamura, T. Kihara, H. Nojiri

Polyhedron 136 149 - 154 2017年

Field induced reentrant magnetoelectric phase in LiNiPO₄ 査読

R. T. Petersen, E. Fogh, T. Kihara, J. Jensen, K. Fritsch, J. Lee, G. E. Granroth, M. B. Stone, D. Vaknin, H. Nojiri, N. B. Christensen

Physical Review B 95 164421-1 - 164421-8 2017年

Spin Structure Change in Co-Substituted BiFeO₃ 査読

H. Yamamoto, T. Kihara, K. Oka, M. Tokunaga, K. Mibu, M. Azuma

Journal of Physical Society of Japan 85 064704-1 - 064704-4 2016年

Thermodynam- ics and Kinetics of Martensitic Transformation in Ni-Mn-based magnetic shape memory alloys 査読

X. Xu, R. Kainuma, T. Kihara, W. Ito, M. Tokunaga, T. Kanomata

MATEC Web of Conference 33 ( 10 ) 01004 2015年

Electronic Structure of a Mixed-Metal Fluoride-Centered Triangle Complex: A. Potential Qubit Component 査読

J. P. S. Walsh, S. B. Meadows, A. Ghirri, F. Moro, M. Jennings, W. F. Smith, D. M. Graham, T. Kihara, H. Nojiri, I. J. Vitorica-Yrezabal, G. A. Timco, D. Colllison, E. J, L. McInnes, R. E, P. Winpenny

Inorganic Chemistry 54 12019 - 12026 2015年

Magnetic and Dielectric Properties in Multiferroic Cu3Mo2O9 under High Magnetic Fields 査読

H. Kuroe, K. Aoki, R. Kino, T. Sato, H. Kuwahara, T. Sekine, T. Kihara, M. Akaki, Y. Kohama, M. Tokunaga, A. Matsuo, K. Kindo, M. Hase, K. Takihana, H. Kitazawa, K. Oka, T. Ito, H. Eisaki

JPS Conf. Proc. 3 014056 2014年6月