Developments of ultra-high sensitive high-pressure THz ESR system using the diamond NV centers

• Project/Area Number: 19K21852
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 13:Condensed matter physics and related fields
• Research Institution: Kobe University
• Principal Investigator: Ohta Hitoshi 神戸大学, 分子フォトサイエンス研究センター, 教授 (70194173)
• Co-Investigator(Kenkyū-buntansha): 櫻井 敬博 神戸大学, 研究基盤センター, 助教 (60379477)
• Project Period (FY): 2019-06-28 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000); Fiscal Year 2021: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2019: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: NVセンター / 光検出磁気共鳴 / ダイヤモンドアンビルセル / テラヘルツ / 電子スピン共鳴 / 窒素-空孔中心 / ダイヤモンドアンビル圧力セル

Outline of Research at the Start

本研究は，100GPaを超える超高圧を発生できるが，内径0.5mm以下と極端に小さい試料空間のため，これまでミクロスコピックな電子状態情報を得られる電子スピン共鳴(ESR)測定が従来手法で不可能であったダイヤモンドアンビル圧力セルにおけるESR測定を，新規測定法開発で可能にすることを目指す。具体的には，圧力セルのダイヤモンドに含まれる欠陥NV-センターを用いた光検出磁気共鳴(ODMR)のによるテラヘルツESRの開発を目指すが，前例がない開発なので圧力セルを用いたODMR手法によるテラヘルツESR測定の実証を本研究のゴールとする。

Outline of Final Research Achievements

Due to the COVID-19 pandemic from the beginning of the research, it became almost impossible to exchange the latest information with the vendors and researchers who are indispensable for such Grant-in-Aid for Challenging Exploratory Research, so the plan showed a big delay. However, in 2021, it became possible to visit face-to-face society meetings and other laboratories, prepare for joint research on equipment necessary for demonstration experiments, and purchase a suitable diamond anvil pressure cell with this budget. Preparations for conducting a demonstration experiment were completed in the end of the January, 2022. However, due to the application of the COVID-19 priority measures in Japan, the visiting experiment could not be completed within the period. Demonstration experiments will be conducted soon, and we can move on to the next development stage.

Academic Significance and Societal Importance of the Research Achievements

ヘリウムガスの液化が極低温を実現し超伝導の発見に繋がったように，極限環境における新計測法の実現は，物性物理学の発展に寄与することは間違いない。特に，ダイヤモンドアンビル圧力セルが実現する超高圧は，酸素の超伝導発見の例を待つまでもなく未踏のフロンティアであり，そこに電気抵抗や放射光以外の電子のミクロスコピック測定であるテラヘルツ電子スピン共鳴測定を実現するのは世界で初めての試みであり，その意義は計り知れない。

Research Products

• [Int'l Joint Research] Leibniz IFW Dresden,/TU Dresden(ドイツ)
• [Journal Article] High-Pressure THz ESR (2021)
  • Author(s): Sakurai Takahiro、Ohta Hitoshi、Hara Shigeo、Saito Yu
  • Journal Title: Applied Magnetic Resonance Volume: 52 Issue: 4 Pages: 267-281
  • DOI: 10.1007/s00723-020-01299-7
  • NAID: 120007033586
  • Peer Reviewed
• [Journal Article] Continuous control of classical-quantum crossover by external high pressure in the coupled chain compound CsCuCl3 (2021)
  • Author(s): Yamamoto Daisuke、Sakurai Takahiro、Okuto Ryosuke、Okubo Susumu、Ohta Hitoshi、Tanaka Hidekazu、Uwatoko Yoshiya
  • Journal Title: Nature Communications Volume: 12 Issue: 1 Pages: 1-9
  • DOI: 10.1038/s41467-021-24542-6
  • NAID: 120007125724
  • Peer Reviewed / Open Access
• [Journal Article] Development of Pressure Calibration Method in High-Pressure THz ESR System (2021)
  • Author(s): Sakurai Takahiro、Yasutani Yoshimasa、Sugawara Hitoshi、Okubo Susumu、Ohta Hitoshi
  • Journal Title: Applied Magnetic Resonance Volume: 53 Issue: 3-5 Pages: 763-775
  • DOI: 10.1007/s00723-021-01395-2
  • Peer Reviewed
• [Journal Article] Pressure control of the magnetic anisotropy of the quasi-two-dimensional van der Waals ferromagnet Cr2Ge2Te6 (2020)
  • Author(s): T. Sakurai, B. Rubrecht, L. T. Corredor, R. Takehara, M. Yasutani, J. Zeisner, A. Alfonsov, S. Selter, S. Aswartham, A. U. B. Wolter, B. Bu_chner, H. Ohta, and V. Kataev
  • Journal Title: Phys. Rev. B Volume: 103 Issue: 2 Pages: 1-8
  • DOI: 10.1103/physrevb.103.024404
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Helimagnetic Structure and Heavy-Fermion-Like Behavior in the Vicinity of the Quantum Critical Point in Mn3P (2020)
  • Author(s): Kotegawa Hisashi、Matsuda Masaaki、Ye Feng、Tani Yuki、Uda Kohei、Kuwata Yoshiki、Tou Hideki、Matsuoka Eiichi、Sugawara Hitoshi、Sakurai Takahiro、Ohta Hitoshi、Harima Hisatomo、Takeda Keiki、Hayashi Junichi、Araki Shingo、Kobayashi Tatsuo C.
  • Journal Title: Physical Review Letters Volume: 124 Issue: 8 Pages: 1-6
  • DOI: 10.1103/physrevlett.124.087202
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] First-order phase transition to a nonmagnetic ground state in nonsymmorphic NbCrP (2020)
  • Author(s): Y. Kuwata, H. Kotegawa, H. Tou, H. Harima, Q.-P. Ding, K. Takeda, J. Hayashi, E. Matsuoka, H. Sugawara, T. Sakurai, H. Ohta, Y. Furukawa
  • Journal Title: Phys. Rev. B Volume: 102 Issue: 20
  • DOI: 10.1103/physrevb.102.205110
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Multi-extreme THz ESR : Recent Developments and Applications (2021)
  • Author(s): H. Ohta
  • Organizer: ISMAR-APNMR2021
  • Int'l Joint Research / Invited
• [Presentation] Multi-Extreme THz ESR at the Present Stage (2021)
  • Author(s): H. Ohta
  • Organizer: IRMMW-THz2021
  • Int'l Joint Research / Invited
• [Presentation] Multi-extreme THz ESR: current status and future (2021)
  • Author(s): H. Ohta
  • Organizer: MDMR2021
  • Int'l Joint Research / Invited
• [Presentation] 三角格子反強磁性体CsCuCl3の高圧下強磁場ESR (2020)
  • Author(s): 櫻井敬博, 奥藤涼, 大久保晋, 太田仁, 上床美也, 田中秀数, 世良文香, 高阪勇輔, 秋光純, 世良正文, 井上克也
  • Organizer: 日本物理学会第75回年次大会
• [Presentation] 三角格子反強磁性体CsCuCl3の高圧下強磁場ESR II (2020)
  • Author(s): 櫻井敬博, 奥藤涼, 大久保晋, 太田仁, 上床美也, 田中秀数, 世良文香, 高阪勇輔, 秋光純, 世良正文, 井上克也
  • Organizer: 日本物理学会2020年秋季大会
• [Presentation] 圧力下サブミリ波ESR装置の開発と応用 (2020)
  • Author(s): 櫻井敬博, 安谷佳将, 竹原良祐, 大久保晋, 太田仁
  • Organizer: 第29回日本赤外線研究会
• [Presentation] 高圧下強磁場ESRシステムの開発と常磁性化合物Co Tutton塩への応用 (2020)
  • Author(s): 櫻井敬博, 安谷佳将, 竹原良祐, 大久保晋, 太田仁
  • Organizer: 第59回電子スピンサイエンス学会年会
• [Presentation] 高圧下THz ESRシステムにおける圧力較正手法の確立と応用 (2020)
  • Author(s): 櫻井敬博, 安谷佳将, 菅原仁, 大久保晋, 太田仁
  • Organizer: 第61回高圧討論会
• [Presentation] 圧力下THz ESR装置における圧力較正手法の開発と応用 (2020)
  • Author(s): 櫻井敬博, 安谷佳将, 竹原良祐, 菅原仁, 大久保晋, 太田仁
  • Organizer: 日本物理学会第76回年次大会
• [Presentation] Development of high-pressure THz ESR system and its application to triangular lattice antiferromagnet CsCuCl3 (2020)
  • Author(s): T. Sakurai, R. Okuto, S. Okubo, H. Ohta, Y. Uwatoko, H. Tanaka, A. Sera, Y. Kousaka, J. Akimitsu, M. Sera, K. Inoue
  • Organizer: Asia-Pacific Conference on Research in High Magnetic Fields & KINKEN Materials Science School 2020 for Young Scientists
  • Int'l Joint Research
• [Presentation] Development of Multi-extreme THz ESR System and Its Application to Orthogonal Dimer Spin Substance SrCu2(BO3)2 (2020)
  • Author(s): T. Sakurai K. Hijii, S. Okubo, H. Ohta, Y. Uwatoko
  • Organizer: International Workshop on Quantum Magnets in Extreme Conditions
  • Int'l Joint Research / Invited
• [Presentation] Recent Developments of Multi-Extreme THz ESR (2020)
  • Author(s): H. Ohta, S. Okubo, E. Ohmichi, T. Sakurai, H. Takahashi, S. Hara
  • Organizer: IRMMW-THz 2020
  • Int'l Joint Research / Invited
• [Presentation] Multi-extreme THz ESR: present and future (2020)
  • Author(s): H. Ohta, S. Okubo, E. Ohmichi, T. Sakurai, H. Takahashi, S. Hara, Y. Saito
  • Organizer: Modern Development of Magnetic Resonance 2020
  • Int'l Joint Research / Invited