Theoretical Study for Anomalous Properties due to Fluctuations of Non-magnetic Degrees of Freedom
| Project/Area Number |
17K05555
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Osaka University |
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Principal Investigator |
Miyake Kazumasa 大阪大学, 大学院理学研究科, 招へい教授 (90109265)
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| Project Period (FY) |
2017-04-01 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Keywords | 量子臨界価数転移 / 原子価スキッピング / 電荷近藤効果 / ４極子近藤効果 / 価数スキップ現象 / NMR緩和率の異常 / メタ磁性転移 / 遍歴・局在２重性 / ２チャンネル近藤効果 / 電気４極子ゆらぎ / 多準位近藤効果 / 原子価スキップ現象 / ２チャンネルアンダーソン格子モデル / UTe2の多超伝導相の理論 / 価数転移臨界現象 / 臨界価数ゆらぎと熱起電力 / 強相関準結晶 |
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| Outline of Final Research Achievements |
In order to clarify the origin of unconventional physical phenomena originate from the fluctuations of non-magnetic local degrees of freedom, such as valence and electric quadrupole moment, three subjects were investigated. Namely, "quantum critical phenomena of valence transition", "charge Kondo effect",and "electric quadrupole fluctuations" were investigated theoretically. As a result, new insights were obtained as explicitly discussed below. These achievements were reported in international conferences (20) and domestic conferences (31),in which 14 resentations were invited talks.
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| Academic Significance and Societal Importance of the Research Achievements |
価数ゆらぎに（Valence Fluctuations）関する物理の研究は、20世紀後半に多くの研究の蓄積はあったが、それは主に静的性質に関するものであった。21世紀に入るころから、価数の２次的相転移に伴う臨界ゆらぎが電気抵抗や比熱の温度依存性を始めとするとする様々な物性に非自明な振舞いを生じることが次第に分かってきた。この研究分野は、20世紀を通じて多くの研究成果が蓄積されてきた磁性研究の分野に比べると研究の発展段階は初期の段階にあったと言える。本基盤研究（C)では、価数ゆらぎの物理をより広く「非磁性自由度のゆらぎ」に起因する異常物性を解明するという点に学術的意義がある。
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Report
(7 results)
Research Products
(85 results)
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[Journal Article] Charge Kondo Effect Induced by Valence Skipping Dopants in Pb_1-xTl_xTe and Pb_1-xNa_xTe Probed by 125Te-NMR2020
Author(s)
R. Horikawa, M. Yashima, T. Matsumura, S. Maki, H. Mukuda, \km, H. Murakami, P. Walmsley, P. Giraldo-Gallo, T. H. Geballe, I. R. Fisher
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Journal Title
JPS Jpn. Conf. Proc. {\bf 30} (2020) 011127-1-5
Volume: 30
DOI
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Peer Reviewed / Int'l Joint Research
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[Presentation] First-order metamagnetic transition in UTe2 studied by magnetostriction measurements2022
Author(s)
A. Miyake, M. Gen, A. Ikeda, K. Miyake, Y. Shimizu, Y. J. Sato, D. Li, A. Nakamura, Y. Homma, F. Honda, J. Flouquet, M. Tokunaga, and D. Aoki,
Organizer
International Conference on Strongly Correlated Electron Systems (SCES2022)
Related Report
Int'l Joint Research
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[Presentation] Charge Kondo Effect Induced by Valence Skipping Dopants in Pb_1-xTl_xTe Probed by ^{125}Te- and ^{205}Tl-NMR2019
Author(s)
R. Horikawa, M. Yashima, T. Matsumura, S. Maki, H. Mukuda, K. Miyake, H. Murakami, P. Walmsley, P. Giraldo-Gallo, T. H. Geballe, I. R. Fisher
Organizer
International Conference on Strongly Correlated Electron Systems 2019
Related Report
Int'l Joint Research
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[Presentation] ドーパントサイトから見た(Pb_{1-x}Tl_x)Te超伝導体におけるNMR緩和率の異常と電荷近藤効果2019
Author(s)
堀川瑠星, 八島光晴, 松村隆史, 牧翔太, 椋田秀和, 三宅和正, 村上博成, P. Walmsley, P. Giraldo-Gallo, T. Geballe, I. Fisher
Organizer
日本物理学会第74回年次大会（2019年）
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[Presentation] PbTe系における電荷近藤効果の微視的電子状態とドーパント依存性2018
Author(s)
八島光晴, 堀川琉星, 松村隆史, 牧翔太, 椋田秀和, 三宅和正, 村上博成, P. Walmsley, P. Giraldo-Gallo, T. Geballe, I. Fisher
Organizer
日本物理学会第73回年次大会（2018年）
Related Report
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