Study on uranium ferromagnetic superconductors with advanced high pressure technique
Project/Area Number |
16K05463
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Condensed matter physics II
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Research Institution | Japan Atomic Energy Agency |
Principal Investigator |
Tateiwa Naoyuki 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 先端基礎研究センター, 研究主幹 (50346821)
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Research Collaborator |
Haga Yoshinori
Yamamoto Etsuji
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Project Period (FY) |
2016-04-01 – 2019-03-31
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Project Status |
Completed (Fiscal Year 2018)
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Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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Keywords | ウラン系強磁性超伝導 / 高圧実験 / 高圧下磁化測定 / スピンのゆらぎ / 臨界指数 / スピンのゆらぎ理論 / 強相関電子系 / 磁性 |
Outline of Final Research Achievements |
We have studied uranium ferromagnetic superconductors by magnetic measurements at high pressures. At first, our pressure cell has been modified in order to produce good hydrostatic pressure by introducing washers in the cell. We confirmed the applicability of Takahashi’s spin fluctuation theory to actinide 5f systems from the analyses of magnetic data in 80 actinide (uranium, neptunium, and plutonium) ferromagnets. A strong correlation between the characteristic temperature of spin fluctuations T0 and the superconducting transition temperature Tsc has been found in UGe2. The spin fluctuation parameters have been determined for mixed phase URh1-xCoxGe between the other uranium ferromagnetic superconductors URhGe and UCoGe. The dynamical magnetic properties of the uranium ferromagnetic superconductors are studied. We also have studied the classical critical phenomenon in uranium ferromagnets URhSi, URhAl, UCu2Ge2, and UGa2.
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Academic Significance and Societal Importance of the Research Achievements |
本研究課題では、高圧下磁化測定の実験手法が改善され、静水圧下の高い環境下における測定が可能になった。この手法は他の研究分野でも有益である。また、高温超伝導体等の研究では中性子散乱実験などを通して磁気ゆらぎと超伝導の相関が明らかにされ、理論的理解が進展してきた。この点、実験手段が限定されるウラン系化合物では進歩が遅れていた。本研究課題ではTakahashiによるスピンのゆらぎ理論を用いて、ウラン強磁性超伝導物質UGe2等の強磁性ゆらぎの定量的評価が行われ、ゆらぎと超伝導の相関が明らかにされた。他の強相関電子系超伝導物質との比較検討も可能になり、今後の研究の発展に寄与することが期待される。
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Report
(4 results)
Research Products
(35 results)
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[Journal Article] Magnetic field induced phenomena in UIrGe in fields applied along the b axis2018
Author(s)
Jiri Pospisil, Yoshinori Haga, Yoshimitsu Kohama, Atsushi Miyake, Shinsaku Kambe, Naoyuki Tateiwa, Michal Valiska, Petr Proschek, Jan Prokleska, Vladimir Sechovsky, Masashi Tokunaga, Koichi Kindo, Akira Matsuo and Etsuji Yamamoto
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Journal Title
Physical Review B
Volume: 98
Issue: 1
Pages: 014430-014430
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Switching of magnetic ground states across the UIr1-x Rhx Ge alloy system2017
Author(s)
Jiri Pospisil, Yoshinori Haga, Shinsaku Kambe, Yo Tokunaga, Naoyuki Tateiwa, Dai Aoki, Fuminori Honda, Ai Nakamura, Yoshiya Homma, Etsuji Yamamoto, Tomoo Yamamura
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Journal Title
PHYSICAL REVIEW B
Volume: 95
Issue: 15
Pages: 1551381-15
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Effect of Pressure on Magnetism of UIrGe2017
Author(s)
Jiri Pospisil, Jun Gouchi, Yoshinori Haga, Fuminori Honda, Yoshiya Uwatoko, Naoyuki Tateiwa, Shinsaku Kambe, Shoko Nagasaki, Yoshiya Homma, and Etsuji Yamamoto
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Journal Title
Journal of the Physical Society of Japan
Volume: 86
Issue: 4
Pages: 044709-044709
DOI
NAID
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Presentation] ナローギャップ半導体b-US2の33^S-NMR2018
Author(s)
酒井宏典, 服部泰佑, 比嘉 野乃花, 徳永 陽, 立岩 尚之, 山本 悦嗣, 芳賀 芳範, 神戸 振作, A. P. Reyes, E. D. Bauer, F. Ronning, J. D. Thompson
Organizer
日本物理学会2018年秋季大会(物性)
Related Report
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[Presentation] 33^S-NMR study in b-US22018
Author(s)
H. Sakai, T. Hattori, N. Higa, Y. Tokunaga, N. Tateiwa, E. Yamamoto, Y. Haga, S. Kambe, A. P. Reyes, E. D. Bauer, F. Ronning, J. D. Thompson
Organizer
International Workshop on Dual Nature of f-electrons (IWDN 2018)
Related Report
Int'l Joint Research / Invited
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