Development of the muSR-detected electron spin resonance method for elucidating the electronic state of muonium defects

• Project/Area Number: 20K12484
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 80040:Quantum beam science-related
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: Ito Takashi 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, 研究副主幹 (10455280)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2020: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: ミュオニウム欠陥 / ミュオンスピン回転緩和法 / 電子スピン共鳴法 / 水素欠陥 / 水素関連欠陥 / ミュエスアール / 電子スピン共鳴

Outline of Research at the Start

物質中にμ+粒子を打ち込むことで生成されるミュオニウム（Mu）欠陥は、孤立した水素欠陥の電子状態を高い精度で模擬する。このMu欠陥の電子状態はミュエスアール法により解析可能である。しかし、μ+と電子の磁気的結合が弱い常磁性Mu欠陥に関しては、この標準的手法だけでは電子軌道状態について十分な情報が得られないことがある。本研究は、この軌道状態を反映する電子のg値を直接求める手段として「電子スピン共鳴ミュエスアール法」を提案し、浅いMu欠陥やMu+束縛ポーラロンの研究への応用を通して同手法の確立を図るものである。

Outline of Final Research Achievements

In order to open up muonium (Mu) defect research using the electron spin resonance method, we have developed an RF probe required for the experiment and established the method through a demonstration experiment at the Materials and Life Science Experimental Facility at J-PARC. Using this probe, we succeeded in measuring the g-values of paramagnetic Mu defects in rutile TiO2, and obtained a result suggesting that there may be small differences between the g-values of Mu defects and those of paramagnetic H defects. Further improvement of the measurement accuracy of the g-values by means of instrumentation improvements is expected to advance the study of the isotope effects on Mu and H defects.

Academic Significance and Societal Importance of the Research Achievements

常磁性Mu欠陥のg値を測定する手法を確立したことにより、その電子状態をより多角的に解析できるようになった。これは水素とMuのアナロジーに基づいた水素欠陥研究と、水素・Mu欠陥間の差異に関する同位体科学のさらなる発展につながる成果である。また、本研究を通してJ-PARCミュオン実験施設に初めて導入された4He温度におけるRFスピン共鳴技術は、Mu欠陥研究に限らず低温物性研究に広く応用できることから、磁性研究などの他分野への波及効果も期待される。

Research Products

• [Journal Article] SrTiO3 中の格子間水素に束縛されたTi3＋スモールポーラロンの安定性 (2023)
  • Author(s): 伊藤 孝
  • Journal Title: JAEA-Review Volume: 2022-035 Pages: 112-114
  • Open Access
• [Journal Article] Local electronic structure of interstitial hydrogen in MgH2 inferred from muon study (2023)
  • Author(s): Kadono Ryosuke、Hiraishi Masatoshi、Okabe Hirotaka、Koda Akihiro、Ito Takashi U.
  • Journal Title: Journal of Physics: Condensed Matter Volume: 35 Issue: 28 Pages: 285503-285503
  • DOI: 10.1088/1361-648x/acccc7
  • Peer Reviewed
• [Journal Article] Hydrogen-Ti³⁺ Complex as a Possible Origin of Localized Electron Behavior in Hydrogen-Irradiated SrTiO₃ (2022)
  • Author(s): Ito Takashi U.
  • Journal Title: e-Journal of Surface Science and Nanotechnology Volume: 20 Issue: 3 Pages: 128-134
  • DOI: 10.1380/ejssnt.2022-021
  • ISSN: 1348-0391
  • Year and Date: 2022-05-28
  • Peer Reviewed / Open Access
• [Journal Article] 水素照射により金属化されたSrTiO3において観測される局在電子の起源について (2022)
  • Author(s): 伊藤 孝
  • Journal Title: 日本中間子科学会誌「めそん」 Volume: 56 Pages: 21-26
• [Journal Article] Direct measurement of the evolution of magnetism and superconductivity toward the quantum critical point (2022)
  • Author(s): Higemoto Wataru、Yokoyama Makoto、Ito Takashi U.、Suzuki Taiga、Raymond Stephane、Yanase Youichi
  • Journal Title: Proceedings of the National Academy of Sciences Volume: 119 Issue: 49
  • DOI: 10.1073/pnas.2209549119
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Two-step Mott transition in Ni(S,Se)2: μSR studies and charge-spin percolation model (2022)
  • Author(s): Q. Sheng, T. Kaneko, K. Yamakawa, Z. Guguchia, Z. Gong, G. Zhao, G. Dai, C. Jin, S. Guo, L. Fu, Y. Gu, F. Ning, Y. Cai, K. M. Kojima, J. Beare, G. M. Luke, S. Miyasaka, M. Matsuura, S.-i. Shamoto, T. U. Ito, W. Higemoto, A. Gauzzi, Y. Klein, Y. J. Uemura
  • Journal Title: Physical Review Research Volume: 4 Issue: 3
  • DOI: 10.1103/physrevresearch.4.033172
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Quantum critical spin-liquid-like behavior in S = 1/2 quasikagome lattice compound CeRh1-xPdxSn investigated using muon spin relaxation and neutron scattering (2022)
  • Author(s): R. Tripathi, D. T. Adroja, C. Ritter, S. Sharma, C. Yang, A. D. Hiller, M. M. Koza, F. Demmel, A. Sundaresan, S. Langridge, W. Higemoto, T. U. Ito, A. M. Strydom, G. B. G. Stenning, A. Battacharyya, D. Keen, H. C. Walker, R. S. Perry, R. Pratt, Q. Si, T. Takabatake
  • Journal Title: Phys. Rev. B Volume: 106 Issue: 6
  • DOI: 10.1103/physrevb.106.064436
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Hydrogen-Ti3+ Complex as a Possible Origin of Localized Electron Behavior in Hydrogen-Irradiated SrTiO3 (2022)
  • Author(s): Takashi U. Ito
  • Journal Title: e-Journal of Surface Science and Nanotechnology Volume: －
  • Peer Reviewed / Open Access
• [Journal Article] Magnetic Bragg peak enhancement under ultrasound injection (2022)
  • Author(s): Shamoto Shin-ichi、Akatsu Mitsuhiro、Matsuura Masato、Ohira-Kawamura Seiko、Harii Kazuya、Ono Masao、Chang Lieh-Jeng、Ito Takashi U.、Nemoto Yuichi、Ieda Jun'ichi
  • Journal Title: Physical Review Research Volume: 4 Issue: 1 Pages: 013245-013245
  • DOI: 10.1103/physrevresearch.4.013245
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Critical slowing-down and field-dependent paramagnetic fluctuations in the skyrmion host EuPtSi: μSR and NMR studies (2021)
  • Author(s): Higa N.、Ito T. U.、Yogi M.、Hattori T.、Sakai H.、Kambe S.、Guguchia Z.、Higemoto W.、Nakashima M.、Homma Y.、Nakamura A.、Honda F.、Shimizu Y.、Aoki D.、Kakihana M.、Hedo M.、Nakama T.、Onuki Y.、Tokunaga Y.
  • Journal Title: Physical Review B Volume: 104 Issue: 4 Pages: 045145-045145
  • DOI: 10.1103/physrevb.104.045145
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Rabi-oscillation spectroscopy of the hyperfine structure of muonium atoms (2021)
  • Author(s): S. Nishimura, H. A. Torii, Y. Fukao, T. U. Ito, and K. Shimomura et al. (MuSEUM Collaboration)
  • Journal Title: Physical Review A Volume: 104 Issue: 2 Pages: 1-6
  • DOI: 10.1103/physreva.104.l020801
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] High-temperature antiferromagnetism in Yb based heavy fermion systems proximate to a Kondo insulator (2021)
  • Author(s): S. Suzuki, K. Takubo, K. Kuga, W. Higemoto, T. U. Ito, T. Tomita, Y. Shimura, Y. Matsumoto, C. Bareille, H. Wadati, S. Shin, and S. Nakatsuji
  • Journal Title: Physical Review Research Volume: 3 Issue: 2 Pages: 023140-023140
  • DOI: 10.1103/physrevresearch.3.023140
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Sm valence determination of Sm-based Intermetallics using 149Sm Mossbauer and Sm LIII-edge X-ray absorption spectroscopies (2021)
  • Author(s): Tsutsui Satoshi、Higashinaka Ryuji、Nakamura Raito、Fujiwara Kosuke、Nakamura Jin、Kobayashi Yoshio、Ito Takashi U.、Yoda Yoshitaka、Kato Kazuo、Nitta Kiyofumi、Kawamura Naomi、Mizumaki Masaichiro、Matsuda Tatsuma D.、Aoki Yuji
  • Journal Title: Hyperfine Interactions Volume: 242 Issue: 1 Pages: 32-32
  • DOI: 10.1007/s10751-021-01759-x
  • Peer Reviewed / Open Access
• [Journal Article] High-temperature short-range order in Mn3RhSi (2020)
  • Author(s): Hiroki Yamauchi, Dita Puspita Sari, Isao Watanabe, Yukio Yasui, Lieh-Jeng Chang, Keietsu Kondo, Takashi U. Ito, Motoyuki Ishikado, Masato Hagihara, Matthias D. Frontzek, Songxue Chi, Jaime A. Fernandez-Baca, James S. Lord, Adam Berlie, Atsuhiro Kotani, Shigeo Mori, Shin-ichi Shamoto
  • Journal Title: Communications Materials Volume: 1 Issue: 1
  • DOI: 10.1038/s43246-020-0042-1
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] ペロブスカイト型酸化物中のミュオン拡散におけるゼロ点振動の影響 (2023)
  • Author(s): 伊藤 孝, 髭本 亘, 幸田 章宏, 下村 浩一郎
  • Organizer: 日本物理学会2023年春季大会
• [Presentation] μ+SR as a Potential Tool for Depth-resolved Detection of Oxygen Vacancies in Perovskite Oxides (2021)
  • Author(s): Takashi U. Ito
  • Organizer: Material Research Meeting 2021 (MRM2021)
  • Int'l Joint Research / Invited
• [Presentation] Positive Muons in SrTiO3: Electronic Structure of the Hydrogen-Like Defects and Their Potential Use in Depth-Resolved Detection of Oxygen Vacancies (2021)
  • Author(s): Takashi U. Ito
  • Organizer: The 9th International Symposium on Surface Science (ISSS-9)
  • Int'l Joint Research / Invited
• [Presentation] ルチルTiO2中のミュオニウム関連常磁性欠陥に対する電子スピン共鳴 (2021)
  • Author(s): 伊藤 孝
  • Organizer: CIQuS研究会「無機材料中の水素の存在状態と機能発現 II」
  • Invited
• [Presentation] SrTiO3中の微量水素/ミュオニウムの電子状態 (2020)
  • Author(s): 伊藤孝
  • Organizer: 量子ビーム連携研究センター研究会「無機材料中の水素の存在状態と機能発現」
  • Invited
• [Book] Hydrogenomics: The Science of Fully Utilizing Hydrogen (2023)
  • Author(s): Orimo Shin-ichi, Fukutani Katsuyuki, Fujita Ken-ichi (Editors)
  • Total Pages: 304
  • Publisher: Kyoritsu Shuppan Co., Ltd.
  • ISBN: 9784320952072