トポロジカル絶縁体におけるスピンロックの検出

• Project/Area Number: 15J05303
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 国内
• Research Field: Condensed matter physics II
• Research Institution: Sophia University
• Principal Investigator: 松井 一樹 上智大学, 理工学研究科, 特別研究員(DC1)
• Project Period (FY): 2015-04-24 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥2,400,000 (Direct Cost: ¥2,400,000); Fiscal Year 2017: ¥900,000 (Direct Cost: ¥900,000); Fiscal Year 2016: ¥500,000 (Direct Cost: ¥500,000); Fiscal Year 2015: ¥1,000,000 (Direct Cost: ¥1,000,000)
• Keywords: トポロジカル絶縁体 / NMR / μSR / μＳＲ / スピンロック / ＮＭＲ

Outline of Annual Research Achievements

これまで測定を行ってきたトポロジカル絶縁体試料の表面磁化については，施設の検出限界内では観測できなかった．この原因は実験を行ったPSI研究所（スイス）の測定精度が公称値よりも遥かに低く，重要な表面数ナノメートル領域を低エネルギーミュオンで見ようとすると大きなアーティファクトが生じたためである．なお，このこと自体，施設側も認識していなかった新しい発見である．
本系のように生じる磁化が微小であると見積もられる場合は特に，ミュオン停止位置の詳細な解析かそれに相当する解析の手法を確立する必要がある．そのため，本年度は主にμSRを用いて研究が進められておりNMRによる相補的な検証が進められている，3次元相関のあるダイマー系NH4CuCl3について研究を進め，今後必要になるμSRスペクトルの解析方法についての知見を得た．
NH4CuCl3は零磁場でギャップレスであり，磁場印加に応じてギャップが開閉することで二段階の磁化プラトーを持つ点が特徴である．我々は強磁場μSR・1H-NMRによって検証を試みた．単結晶試料を用い，TF-μSR測定についてはPSIのHAL9500において， NMRについては本研究室の超伝導マグネットを用いて，いずれも8 Tの強磁場下までの磁場範囲において測定を行い，プラトー内外の内部磁場の変化の温度・磁場依存性を調べた．
NMRスペクトル測定により，結晶学的に等価だったダイマーが磁気的に非等価になっていることが明らかとなった．また，横磁化の秩序化があることも明らかになった．NMRスペクトルの解析から得られた磁気構造をもとにμSR測定の結果を解析したところ，ミュオンは陰イオンサイト近傍に停止して内場をプローブしているとして矛盾がないことが分かった．NMRとμSRを相補的に用いることにより，ミュオンの停止位置について，解析の指針が得られた．

Research Progress Status

29年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

29年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Ground State of Quasi-One Dimensional Competing Spin Chain Cs2Cu2Mo3O12 at zero and Finite Fields (2018)
  • Author(s): Matsui Kazuki、Goto Takayuki、Angel Julia、Watanabe Isao、Sasaki Takahiko、Hase Masashi
  • Journal Title: JPS Conf. Proc. Volume: 21 Pages: 011018-011018
  • DOI: 10.7566/jpscp.21.011008
  • Peer Reviewed / Open Access
• [Journal Article] 133 Cs-NMR Study on the Ground State of the Equilateral Triangular Spin Tube CsCrF 4 (2018)
  • Author(s): K Matsui and T Goto and H Manaka and Y Miura
  • Journal Title: Journal of Physics: Conference Series Volume: 969 Pages: 012108-012108
  • DOI: 10.1088/1742-6596/969/1/012108
  • Peer Reviewed / Open Access
• [Journal Article] 133 Cs-NMR study on aligned powder of competing spin chain compound Cs 2 Cu 2 Mo 3 O 12 (2018)
  • Author(s): A Yagi and K Matsui and T Goto and M Hase and T Sasaki
  • Journal Title: Journal of Physics: Conference Series Volume: 21 Pages: 012125-012125
  • DOI: 10.1088/1742-6596/969/1/012125
  • Peer Reviewed / Open Access
• [Journal Article] Rb-NMR study of the quasi-one-dimensional competing spin-chain compound Rb2Cu2Mo3O12 (2017)
  • Author(s): Matsui Kazuki、Yagi Ayato、Hoshino Yukihiro、Atarashi Sochiro、Hase Masashi、Sasaki Takahiko、Goto Takayuki
  • Journal Title: Physical Review B Volume: 96 Issue: 22
  • DOI: 10.1103/physrevb.96.220402
  • Peer Reviewed
• [Journal Article] High field 1H-NMR study around a 1/4 plateau of quantum spin dimer system NH4CuCl3 (2017)
  • Author(s): K. Matsui, M. Fujisawa, H. Tanaka, R. Scheuermann and T. Goto
  • Journal Title: IOP Conf. Series: Journal of Physics: Conf. Series Volume: 828 Pages: 012011-012011
  • DOI: 10.1088/1742-6596/828/1/012011
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] NMR and μ-SR study on competing Heisenberg chain Cs2Cu2Mo3O12 (2017)
  • Author(s): T. Goto, A. Yagi, K. Matsui, I. Watanabe1, T. Sasaki and M. Hase
  • Journal Title: IOP Conf. Series: Journal of Physics: Conf. Series Volume: 828 Pages: 012017-012017
  • DOI: 10.1088/1742-6596/828/1/012017
  • Peer Reviewed / Open Access
• [Journal Article] NMR study on the competing spin chain Rb2Cu2Mo3O12 (2017)
  • Author(s): A. Yagi, K. Matsui, T. Goto, M. Hase and T. Sasaki
  • Journal Title: IOP Conf. Series: Journal of Physics: Conf. Series Volume: 828 Pages: 012016-012016
  • DOI: 10.1088/1742-6596/828/1/012016
  • Peer Reviewed / Open Access
• [Journal Article] The magnetic structure on the ground state of the equilateral triangular spin tube (2016)
  • Author(s): K. Matsui, T. Goto, H. Manaka, Y. Miura
  • Journal Title: Hyperfine Interact Volume: 237 Issue: 1 Pages: 123-123
  • DOI: 10.1007/s10751-016-1330-5
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] NMR study on the quasi one-dimensional quantum spin magnet with ladder structure (2016)
  • Author(s): S. Kobori, K. Matsui, H. Kuwahara, T. Goto, X. Zhang, Y. Nakano, S. Nishihara, K. Inoue, T. Sasaki
  • Journal Title: Hyper. Inter. Volume: 237 Issue: 1 Pages: 116-116
  • DOI: 10.1007/s10751-016-1329-y
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] 19F-NMR study on the Equilateral Triangular Spin Tube CsCrF4 (2015)
  • Author(s): Kazuki Matsui, Takayuki Goto, Hirotaka Manaka, and Yoko Miura
  • Journal Title: 20th International Conference on Magnetism, ICM 2015 Volume: 75 Pages: 726-730
  • DOI: 10.1016/j.phpro.2015.12.094
  • Peer Reviewed / Open Access
• [Journal Article] Low-energy μSR Study on the Tetradymite Topological Insulator Bi1.5Sb0.5TeSe (2015)
  • Author(s): Takayuki Goto, Kazuki Matsui, Tadashi Adachi, Tomi Ohtsuki, Ngoc Han Tu, Yoichi Tanabe, Katsumi Tanigaki, Isao Watanabe, Zaher Salman, Andreas Suter, Thomas Prokscha
  • Journal Title: Physics Procedia Volume Volume: 75 Pages: 100-105
  • DOI: 10.1016/j.phpro.2015.12.014
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] 133Cs/19F-NMRによる正三角スピンチューブ磁性体CsCrF4の磁気構造の検証 II, (2017)
  • Author(s): 松井一樹, 後藤貴行, 真中浩貴, 三浦陽子
  • Organizer: 日本物理学会 第72回年次大会
  • Place of Presentation: 大阪大学（大阪府・豊中市待兼山町 ）
  • Year and Date: 2017-03-18
• [Presentation] NMRで見た擬一次元競合鎖Rb2Cu2Mo3O12の基底状態の磁場変化 (2017)
  • Author(s): 八木彩人, 松井一樹, 星野侑宏, 細谷陽介, 後藤貴行, 長谷正司, 佐々木孝彦
  • Organizer: 日本物理学会 第72回年次大会
  • Place of Presentation: 大阪大学（大阪府・豊中市待兼山町 ）
  • Year and Date: 2017-03-17
• [Presentation] Ground state of quasi-one dimensional competeing spin chain Cs2Cu2Mo3O12 at zero and finite fields (2017)
  • Author(s): K. Matsui, T. Goto, I. Watanabe, T. Sasaki and M. Hase
  • Organizer: The 14th In- ternational Conference on Muon Spin Rotation, Relaxation and Resonance (μSR 2017)
  • Int'l Joint Research
• [Presentation] High-eld TF-SR study around a 1/4 plateau of quantum spin dimer system NH4CuCl3 (2017)
  • Author(s): K. Matsui, T. Goto, T. Suzuki, A. Oosawa, M. Fujisawa, H. Tanaka, I. Watanabe, R. Scheuermann, P. K. Biswas and A. Amato
  • Organizer: RIKEN-USM Symposium International Work- shop on Organic Molecule Systems
  • Int'l Joint Research
• [Presentation] 133Cs-NMR study on the ground state of the equilateral triangular spin tube CsCrF4 (2017)
  • Author(s): K. Matsui, T. Goto, H. Manaka, Y. Miura
  • Organizer: the 28th International Conference on Low Temperature Physics (LT28)
  • Int'l Joint Research
• [Presentation] 133Cs-NMR study on aligned powder of competing spin chain Cs2Cu2Mo3O12 (2017)
  • Author(s): A. Yagi, K. Matsui, ○ T. Goto, M. Hase and T. Sasaki
  • Organizer: the 28th International Conference on Low Temperature Physics (LT28)
  • Int'l Joint Research
• [Presentation] 磁化プラトーを示 す量子スピン磁性体NH4CuCl3 の磁場中NMR (2017)
  • Author(s): 松井一樹, H. Guo, 渡邊功雄, 鈴木栄男, 藤澤真士, 田中秀数, 後藤貴行
  • Organizer: 日本物理学会2017 年秋季大会
• [Presentation] NMRで見た擬一次元競合鎖Rb2Cu2Mo3O12の基底状態の磁場変化 (2016)
  • Author(s): 八木彩人, 松井一樹, 星野侑宏, 細谷陽介, 後藤貴行, 長谷正司, 佐々木孝彦
  • Organizer: 日本物理学会 2016年秋季大会
  • Place of Presentation: 金沢大学（石川県・金沢市角間町）
  • Year and Date: 2016-09-14
• [Presentation] NMRで見たRuダイマー量子スピン磁性体の価数チューニング (2016)
  • Author(s): 後藤貴行, 松井一樹, 細谷陽介, 橋本剛, 遠藤明, 早下隆士, 井口聡, 佐々木孝彦
  • Organizer: 日本物理学会 2016年秋季大会
  • Place of Presentation: 金沢大学（石川県・金沢市角間町）
  • Year and Date: 2016-09-13
• [Presentation] 磁化プラトーを示す量子スピン磁性体NH4CuCl3の磁場中μSR・NMR (2016)
  • Author(s): 松井一樹, H. Guo, 渡邊功雄, 鈴木栄男, 藤澤真士, 田中秀数, R. Scheuermann, 後藤貴行
  • Organizer: 日本物理学会 2016年秋季大会
  • Place of Presentation: 金沢大学（石川県・金沢市角間町）
  • Year and Date: 2016-09-13
• [Presentation] NMR study on the competing spin chain Rb2Cu2Mo3O12 (2016)
  • Author(s): A. Yagi, K. Matsui, Y. Hoshino, H. Kuroe, T. Goto, M. Hase and T. Sasaki
  • Organizer: the 8th International Conference on Highly Frustrated Magnetism 2016 (HFM 2016)
  • Place of Presentation: Taipei（Taiwan）
  • Year and Date: 2016-09-08
  • Int'l Joint Research
• [Presentation] NMR and μ-SR study on competing Heisenberg chain Cs2Cu2Mo3O12 (2016)
  • Author(s): T. Goto, A. Yagi, K. Matsui, I. Watanabe, T. Sasaki and M. Hase
  • Organizer: the 8th International Conference on Highly Frustrated Magnetism 2016 (HFM 2016)
  • Place of Presentation: Taipei（Taiwan）
  • Year and Date: 2016-09-08
  • Int'l Joint Research
• [Presentation] High-field 1H-NMR study around a 1/4 plateau of quantum spin dimer system NH4CuCl3 (2016)
  • Author(s): K. Matsui，H. Guo，I. Watanabe，T. Suzuki，M. Fujisawa，H. Tanaka，R. Scheuermann and T. Goto
  • Organizer: the 8th International Conference on Highly Frustrated Magnetism 2016 (HFM 2016)
  • Place of Presentation: Taipei（Taiwan）
  • Year and Date: 2016-09-08
  • Int'l Joint Research
• [Presentation] μSR/NMR study in a high field on quantum spin system NH4CuCl3 (2016)
  • Author(s): 松井一樹, H. Guo, 渡邊功雄, 鈴木栄男, 藤澤真士, 田中秀数, R. Scheuermann
  • Organizer: 超低速ミュオンが拓く科学シンポジウム/新学術領域 領域会議
  • Place of Presentation: いばらき量子ビーム研究センター（茨城県・那珂郡東海村）
  • Year and Date: 2016-08-26
• [Presentation] NMR study on the quasi one-dimensional quantum spin magnet with ladder structure (2016)
  • Author(s): S. Kobori, K. Matsui, H. Kuwahara, T. Goto, X. Zhang, Y. Nakano, S. Nishihara, K. Inoue, T. Sasaki
  • Organizer: the International Conference on Hyperfine Interactions and their Applications (HYPERFINE 2016)
  • Place of Presentation: Leuven（Belgium）
  • Year and Date: 2016-07-04
  • Int'l Joint Research
• [Presentation] The magnetic structure on the ground state of the equilateral triangular spin tube (2016)
  • Author(s): K. Matsui, T. Goto, H. Manaka, Y. Miura
  • Organizer: the International Conference on Hyperfine Interactions and their Applications (HYPERFINE 2016)
  • Place of Presentation: Leuven（Belgium）
  • Year and Date: 2016-07-04
  • Int'l Joint Research
• [Presentation] Low-energy muSR study on the tetradymite topological insulator Bi1.5Sb0.5TeSe2 (2016)
  • Author(s): T. Goto, K. Matsui, T. Adachi, T. Ohtsuki, N. H. Tu, Y. Tanabe, I. Watanabe, Z. Salman, A. Suter and T. Prokscha
  • Organizer: RIKEN-RAL Muon Facility 25-Years Operation Cerebration and Users Meeting: Frontier of the Muon Science Applications
  • Place of Presentation: Saitama, Japan
  • Year and Date: 2016-02-14
  • Int'l Joint Research
• [Presentation] Low-energy μSR study on the thin-film of tetradymite topological insulator Bi1.5Sb0.5TeSe2 (2016)
  • Author(s): K. Matsui, T. Goto, T. Adachi, T. Ohtsuki, N. H. Tu, Y. Tanabe, K. Tanigaki, I. Watanabe, Z. Salman, A. Suter and T. Prokscha
  • Organizer: International USMM & CMSI Workshop: Frontiers of Materials and Correlated Electron Science - from Bulk to Thin Films and Interfaces
  • Place of Presentation: Tokyo, Japan
  • Year and Date: 2016-01-05
  • Int'l Joint Research
• [Presentation] Low-energy μSR study on the tetradymite topological insulator Bi1.5Sb0.5TeSe2 (2015)
  • Author(s): K. Matsui, T. Goto, T. Adachi, T. Ohtsuki, H. Tu, Y. Tanabe, I. Watanabe, Z. Salman, A. Suter, T. Prokscha
  • Organizer: 20th International Conference on Magnetism (ICM 2015)
  • Place of Presentation: Barcelona, Spain
  • Year and Date: 2015-07-05
  • Int'l Joint Research