Search for quantum skyrmions
| Project/Area Number |
19K21839
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 13:Condensed matter physics and related fields
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| Research Institution | Tohoku University |
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Principal Investigator |
Sato Taku 東北大学, 多元物質科学研究所, 教授 (70354214)
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| Project Period (FY) |
2019-06-28 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2019: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
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| Keywords | quantm skyrmion / neutron scattering / high energy resolution / inelastic scattering / 磁気スカーミオン / 量子スカーミオン / 中性子散乱 / 中性子非弾性散乱 / quantum skyrmion |
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| Outline of Research at the Start |
スカーミオンとは連続場中のトポロジカル欠陥であり、2009 年にカイラル磁性体 MnSi のスピンテクスチャーとして観測され磁性物理学の中心的課題の一つとなった。これまで知られている磁気スカーミオンは古典論の範囲で熱力学的に説明できる。本研究で我々は純粋に量子力学的な準粒子としての量子スカーミオンを探索する。この課題は 、新奇な非自明トポロジカル準粒子の探索という大きな意味を持つ。探索には極限まで制御された極低温磁場環境下での超高エネルギー分解能中性子非弾性散乱が必要になるが、本研究で開発される実験技術は他の量子スピン系における新奇準粒子発見に強力な技術となることも期待される。
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| Outline of Final Research Achievements |
Skyrmions are originally proposed as topological defects in a continuum field. Magnetic skyrmions, skyrmion-like defects in magnetization field, were observed as spin textures in the chiral magnet MnSi in 2009, and have become a central issue in condensed matter physics. Because of inherent topological protection of the magnetic skyrmions, they have attracted wide attention and been intensively studied from fundamental physics viewpoint to technological application as information carriers. In this study, we proposed to search for quantum skyrmions. We have systematically synthesized a large number of materials, mainly itinerant quantum magnets including Ce3+ and Yb3+, and measured their bulk magnetism and neutron scattering. As a representative result, we found a triple-q structure in a hexagonal Yb intermetallic compound near absolute zero temperature. We have also obtained various other results.
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| Academic Significance and Societal Importance of the Research Achievements |
磁気スカーミオンは磁性物理学からデバイス応用までの広い観点から精力的に研究されている。当初磁気スカーミオンは反転対称性の破れた系で観測されてきたが、最近では反転対称な系でも観測されるなどますます普遍的に見られている。一方で、それらのほとんどは有限温度で観測される熱揺らぎ起源と考えられている。本研究で我々が発見した絶対零度近傍での triple-q 構造形成は、過去に観測された例が少なく新規なものと考えられる上に、これまで知られている熱揺らぎ起源の磁気スカーミオンとは本質的に異なる可能性があり、この発見の学術的意義は大きいと考えられる。
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Report
(5 results)
Research Products
(55 results)
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[Journal Article] Strongly Electron-Correlated Semimetal RuI3 with a Layered Honeycomb Structure2021
Author(s)
Kazuhiro Nawa, Yoshinori Imai, Youhei Yamaji, Hideyuki Fujihara,Wakana Yamada, Ryotaro Takahashi, Takumi Hiraoka, Masato Hagihala, Shuki Torii, Takuya Aoyama, Takamasa Ohashi, Yasuhiro Shimizu, Hirotada Gotou, Masayuki Itoh, Kenya Ohgushi, and Taku J. Sato
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Journal Title
Jounal of the Physical Society of Japan
Volume: 90
Issue: 12
Pages: 123703-123703
DOI
NAID
Related Report
Peer Reviewed
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[Presentation] Structural and magnetic characterization of Cu2OSeO3 polymorph synthesized under high-pressure2023
Author(s)
H. C. Wu, D. Okuyama, K. Nawa, W. T. Chen, C. H. Lu, T. W. Yen, S. M. Huang, S. Calder, D. Morikawa, M. Terauchi, S. Torii, T. J. Sato
Organizer
日本物理学会2023年春季大会（オンライン）
Related Report
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[Presentation] Magnetic structure and excitations of the Kitaev model candidate RuBr32022
Author(s)
Kazuhiro Nawa, Takumi Hiraoka, Yoshinori Imai, Ryo Murasaki, Pharit Piyawongwatthana, Maiko Kofu, Richard Mole, Wakana Yamada, Hideyuki Fujihara, Ryotaro Takahashi, Masato Hagihala, Shuki Torii, Hirotada Gotou, Kenya Ohgushi, Taku J Sato
Organizer
International Conference on Neutron Scattering (ICNS)
Related Report
Int'l Joint Research
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[Presentation] Spatial Inhomogeneous Deformation of the Moving Magnetic Skyrmion Lattice in MnSi under Electric Current Flow2019
Author(s)
D. Okuyama,M. Bleuel,J.S. White,Q. Ye,J. Krzywon,G. Nagy,Z.Q. Im,I. Zivkovic,M. Bartkowiak,H.M. Ronnow,S. Hoshino,J. Iwasaki,N. Nagaosa,A. Kikkawa,Y. Taguchi,Y. Tokura,D. Higashi,J.D. Reim,Y. Nambu,T.J. Sato
Organizer
International Conference on Strongly Correlated Electron Systems (SCES) 2019
Related Report
Int'l Joint Research
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[Presentation] Plastic deformation of the moving magnetic skyrmion lattice in MnSi under electric current flow2019
Author(s)
D. Okuyama,M. Bleuel,J.S. White,Q. Ye,J. Krzywon,G. Nagy,Z.Q. Im,I. Zivkovic,M. Bartkowiak,H. M. Ronnow,S. Hoshino,J. Iwasaki,N. Nagaosa,A. Kikkawa,Y. Taguchi,Y. Tokura,D. Higashi,J. D. Reim,Y. Nambu,T. J. Sato
Organizer
The 3rd Asia-Oceania Conference on Neutron Scattering 2019 (AOCNS 2019)
Related Report
Int'l Joint Research
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