Investigation on electromagnon excitation of spin gap system by frequecny-sweep type ESR measurement

• Project/Area Number: 16K05416
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Kobe University
• Principal Investigator: Sakurai Takahiro 神戸大学, 研究基盤センター, 助教 (60379477)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: スピンカレント / 周波数掃引型ESR / スピンギャップ / エレクトロマグノン / スピンカレント機構

Outline of Final Research Achievements

We investigated the possibility that the origin of the direct transition from the singlet ground state to the excited triplet states which is observed in the spin gap system consisting of S = 1/2 antiferromagnetic spin dimer is the electromagnon excitation which comes from the spin current mechanism. We developed the frequency sweep type ESR system in THz region. The excitation from the singlet to the Sz = 0 state of the triplet states was successfully observed. Since this excitation is independent on the magnetic field and constant, only frequency sweep type ESR measurement can observe it. By taking the ESR selection rule of this system into account, we concluded that the observed excitation is the electromagnon coming from the spin current mechanism.

Academic Significance and Societal Importance of the Research Achievements

エレクトロマグノンの平行モードの観測が、その識別手段として有効であることを示す事が出来た。ESRにおける直接遷移に関しては、Dzyaloshinsky-Moriya相互作用が存在する場合のESRの選択則については理論的に研究されてきたが、実験結果を満足に説明できるケースはむしろ例外的で、その統一的な理解には及んでいない。スピンカレント機構が直接遷移を許容にする一般則として加われば、ESR の選択則が非常に豊になってかつその研究が進む。更に、本研究でスピンギャップ系においてエレクトロマグノンが確認されれば、エレクトロマグノンの新しい探索対象を一気に広げると期待される。

Research Products

• [Journal Article] Spectroscopic and magnetic properties of Fe2+ (3d6; S= 2) ions in Fe(NH4)2(SO4)2・6H2O ? Modeling zero-field splitting and Zeeman electronic parameters by microscopic spin Hamiltonian approach (2018)
  • Author(s): Zajac Magdalena、Rudowicz Czeslaw、Ohta Hitoshi、Sakurai Takahiro
  • Journal Title: Journal of Magnetism and Magnetic Materials Volume: 449 Pages: 94-104
  • DOI: 10.1016/j.jmmm.2017.09.027
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Direct Observation of the Quantum Phase Transition of SrCu2(BO3)2 by High-Pressure and Terahertz Electron Spin Resonance (2018)
  • Author(s): T. Sakurai, Y. Hirao, K. Hijii, S. Okubo, H. Ohta, Y. Uwatoko, K. Kudo, and Y. Koike
  • Journal Title: Journal of the Physical Society of Japan Volume: 87 Issue: 3 Pages: 033701-033701
  • DOI: 10.7566/jpsj.87.033701
  • NAID: 120006466525
  • Peer Reviewed / Open Access
• [Journal Article] Pressure Effect on Zero-Field Splitting Parameter of Hemin: Model Case of Hemoproteins under Pressure (2018)
  • Author(s): Tsubasa Okamoto、Eiji Ohmichi、Yu Saito、Takahiro Sakurai、Hitoshi Ohta
  • Journal Title: The Journal of Physical Chemistry B Volume: 122 Issue: 27 Pages: 6880-6887
  • DOI: 10.1021/acs.jpcb.8b03128
  • Peer Reviewed
• [Journal Article] Paramagnetic ionic liquids exhibiting thermochromism based on monomer-dimer equilibrium of cationic half-sandwich complexes (2018)
  • Author(s): T. Inagaki, T. Mochida, K. Takahashi, T. Sakurai, H. Ohta
  • Journal Title: J. Mol. Liq. Volume: 269 Pages: 882-885
  • DOI: 10.1016/j.molliq.2018.08.119
  • Peer Reviewed
• [Journal Article] Development and application of 2.5?GPa?25?T high-pressure high-field electron spin resonance system using a cryogen-free superconducting magnet (2018)
  • Author(s): Sakurai T.、Kimura S.、Kimata M.、Nojiri H.、Awaji S.、Okubo S.、Ohta H.、Uwatoko Y.、Kudo K.、Koike Y.
  • Journal Title: Journal of Magnetic Resonance Volume: 296 Pages: 1-4
  • DOI: 10.1016/j.jmr.2018.08.005
  • Peer Reviewed
• [Journal Article] Dzyaloshinsky-Moriya Interaction and the Ground State in S=3/2 Perfect Kagome Lattice Antiferromagnet KCr3(OH)6(SO4)2 (Cr-Jarosite) Studied by X-Band and High-Frequency ESR (2017)
  • Author(s): S. Okubo, R. Nakata, S. Idehara, N. Takahashi, T. Sakurai, W. Zhang, H. Ohta, T. Shimokawa, T. Sakai, K. Okuta, S. Hara, and H. Sato
  • Journal Title: Journal of the Physical Society of Japan Volume: 86 Issue: 2 Pages: 024703-024703
  • DOI: 10.7566/jpsj.86.024703
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Thermochromic Magnetic Ionic Liquids from Cationic Nickel(II) Complexes Exhibiting Intramolecular Coordination Equilibrium (2017)
  • Author(s): Xue Lan; Tomoyuki Mochida; Yusuke Funasako; Kazuyuki Takahashi; Takahiro Sakurai; Hitoshi Ohta
  • Journal Title: Chem. - Eur. J. Volume: 23 Issue: 4 Pages: 823-831
  • DOI: 10.1002/chem.201604420
  • NAID: 120006337785
  • Peer Reviewed / Open Access
• [Journal Article] Cooperative spin-crossover transition from three-dimensional purely π-stacking interactions in a neutral heteroleptic azobisphenolate FeIII complex with a N3O3 coordination sphere (2017)
  • Author(s): Suguru Murata; Kazuyuki Takahashi; Tomoyuki Mochida; Takahiro Sakurai; Hitoshi Ohta; Takashi Yamamoto; Yasuaki Einaga
  • Journal Title: Dalton Trans. Volume: 印刷中 Issue: 18 Pages: 5786-5789
  • DOI: 10.1039/c7dt01030c
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Single-crystal-to-single-crystal transformation in hydrogen-bond- induced high-spin pseudopolymorphs from protonated cation salts with a pai-extended spin crossover Fe(III) complex anion (2017)
  • Author(s): Suguru Murata; Kazuyuki Takahashi; Takahiro Sakurai; Hitoshi Ohta
  • Journal Title: Polyhedron Volume: 印刷中 Pages: 170-175
  • DOI: 10.1016/j.poly.2017.03.046
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] High-field/high-pressure ESR (2017)
  • Author(s): Sakurai T.、Okubo S.、Ohta H.
  • Journal Title: J. Magn. Reson. Volume: 280 Pages: 3-9
  • DOI: 10.1016/j.jmr.2017.01.023
  • Peer Reviewed
• [Journal Article] Electron magnetic resonance data on high-spin Mn(III; S = 2) ions in porphyrinic and salen complexes modeled by microscopic spin Hamiltonian approach (2017)
  • Author(s): Tadyszak Krzysztof、Rudowicz Czeslaw、Ohta Hitoshi、Sakurai Takahiro
  • Journal Title: Journal of Inorganic Biochemistry Volume: 175 Pages: 36-46
  • DOI: 10.1016/j.jinorgbio.2017.06.006
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] High-frequency EMR data for Fe 2+ ( S = 2) ions in natural and synthetic forsterite revisited - Fictitious spin S' = 1 versus effective spin S' = 2 approach (2017)
  • Author(s): Kozanecki Michal、Rudowicz Czeslaw、Ohta Hitoshi、Sakurai Takahiro
  • Journal Title: Journal of Alloys and Compounds Volume: 726 Pages: 1226-1235
  • DOI: 10.1016/j.jallcom.2017.07.227
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Application of a high-frequency ESR technique using a SQUID magnetometer to a model complex of hemoproteins (2017)
  • Author(s): Tsubasa Okamoto, Takahiro Sakurai, Eiji Ohmichi, Hitoshi Ohta
  • Journal Title: J. Jpn. Soc. Infrared Science & Technology Volume: 27 Pages: 56-64
  • NAID: 40021287456
  • Peer Reviewed
• [Journal Article] Valence Control of Ionic Molecular Crystals: Effect of Substituents on the Structures and Valence States of Biferrocenium Salts with Fluoro Tetracyanoquinodimethanides (2017)
  • Author(s): Mochida Tomoyuki、Funasako Yusuke、Kimata Hironori、Tominaga Takumi、Sakurai Takahiro、Ohta Hitoshi
  • Journal Title: Cryst. Growth Des. Volume: 17 Issue: 11 Pages: 6020-6029
  • DOI: 10.1021/acs.cgd.7b01147
  • Peer Reviewed
• [Presentation] Shastry-Sutherland物質SrCu2(BO3)2の高圧下ESRによる量子相転移の観測 (2019)
  • Author(s): 櫻井敬博
  • Organizer: 第2回スピン系物理研究会、神戸大学（兵庫県）
• [Presentation] 25T無冷媒型超伝導磁石を用いた直交ダイマー系SrCu2(BO3)2の高圧下ESR (2019)
  • Author(s): 櫻井敬博・奥藤涼介・木村尚次郎・木俣基・野尻浩之・太田仁・大久保晋・上床美也・工藤一貴・小池洋二
  • Organizer: 日本物理学会第74回年次大会、九州大学（福岡県）
• [Presentation] Development and application of high-field high-pressure ESR system in THz region (2018)
  • Author(s): T. Sakurai, K. Hijii, S. Okubo, H. Ohta, S. Kimura, H. Nojiri, Y. Uwatoko, K. Kudo, Y. Koike
  • Organizer: International Conference on Coordination Chemistry, Sendai, Japan
  • Int'l Joint Research
• [Presentation] Development of high-pressure high-field ESR system and application to orthogonal dimer spin system SrCu2(BO3)2 (2018)
  • Author(s): T. Sakurai, K. Hijii, R. Okuto, S. Kimura, H. Nojiri, S. Okubo, H. Ohta, Y. Uwatoko, K. Kudo, Y. Koike
  • Organizer: The 16th international conference on megagauss magnetic field generation and related topics, Kashiwa, Japan
  • Int'l Joint Research
• [Presentation] 直交ダイマー系SrCu2(BO3)2の圧力下THz ESRによる量子相転移の観測 (2018)
  • Author(s): 櫻井敬博
  • Organizer: 日本物理学会2018年秋季大会、同志社大学（京都府）
  • Invited
• [Presentation] 圧力下ESRによる直交ダイマー系SrCu2(BO3)2の圧力誘起量子相転移の観測 (2018)
  • Author(s): 櫻井敬博
  • Organizer: 基研研究会「スピン系物理の最前線」、京都大学（京都府）
  • Invited
• [Presentation] 高圧強磁場ESRの開発と応用-直交ダイマー系SrCu2(BO3)2の結果を中心に- (2018)
  • Author(s): 櫻井敬博
  • Organizer: 第五回西日本強磁場科学研究会、神戸大学（兵庫県）
• [Presentation] 25 T無冷媒型超伝導磁石を用いた高圧下ESR装置の開発 (2018)
  • Author(s): 櫻井敬博・木村尚次郎・木俣基・野尻浩之・大久保晋・太田仁・工藤一貴・小池洋二
  • Organizer: 第59回高圧討論会、岡山理科大学（岡山県）
• [Presentation] 三角格子反強磁性体CsCuCl_3_のプラトー領域における圧力下強磁場ESR (2018)
  • Author(s): 櫻井敬博，大木瑛登，石村謙斗，岡本翔，高橋英幸，肘井敬吾，大道英二，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73回年次大会
• [Presentation] KCuCl3における圧力下THz-ESR測定による圧力誘起相転移の観測 (2017)
  • Author(s): 櫻井敬博、平尾祐樹、大久保晋、太田仁、上床美也、田中秀数
  • 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）
  • Year and Date: 2017-03-17
• [Presentation] Development of Ceramics for the Inner Parts of the Pressure Cell by Electromagnetic Wave Heating (2017)
  • Author(s): T. Sakurai, Y. Hirao, E. Ohki, S. Okubo, H. Ohta, T. Nishiwaki, S. Mitsudo and Y. Uwatoko
  • Organizer: The 6th International Workshop on Far-Infrared Technologies (IW-FIRT2017) and The 2nd International Symposium on Development of High Power Terahertz Science and Technology (DHP-TST 2017)
  • Place of Presentation: 福井大学（福井県・福井市）
  • Year and Date: 2017-03-07
  • Int'l Joint Research
• [Presentation] 量子磁性体CsCuCl3の高圧下THz-ESR測定 (2017)
  • Author(s): 櫻井敬博，大木瑛登，肘井敬吾，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，井上克也櫻井敬博，大木瑛登，肘井敬吾，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: 第58回高圧討論会
• [Presentation] 三角格子反強磁性体CsCuCl_3_の圧力下THz-ESR測定III (2017)
  • Author(s): 櫻井敬博，大木瑛登，肘井敬吾，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: 日本物理学会秋季大会
• [Presentation] 三角格子反強磁性体CsCuCl3の圧力下磁化プラトー現象の起源解明 (2017)
  • Author(s): 大木瑛登, 櫻井敬博, 大久保晋, 太田仁, 上床美也, 田中秀数, 世良文香, 高坂勇輔, 秋光純, 世良正文, 井上克也
  • Organizer: 第４回西日本強磁場研究科学会
• [Presentation] 圧力下ヘミンのTHz領域における多周波数強磁場ESR (2017)
  • Author(s): 齋藤 佑，岡本 翔，大木 瑛登，櫻井 敬博，原茂夫，大道 英二，大久保 晋，太田 仁
  • Organizer: 第56回電子スピンサイエンス学会年会
• [Presentation] 三角格子反強磁性体CsCuCl_3_のテラヘルツ領域における圧力下ESR測定 (2017)
  • Author(s): 大木瑛登，櫻井敬博， 肘井敬吾，大久保晋，太田仁， 上床美也，田中秀数， 世良文香, 高坂勇輔，秋光純，世良正文，井上克也
  • Organizer: 第27回日本赤外線学会研究発表会
• [Presentation] テラヘルツ領域における高圧下ESR装置の開発と応用 (2017)
  • Author(s): 櫻井敬博，大木瑛登， 大久保晋，太田仁
  • Organizer: 第27回日本赤外線学会研究発表会
• [Presentation] 強磁場高圧下テラヘルツESR装置の開発と応用 (2017)
  • Author(s): 櫻井敬博
  • Organizer: 強磁場研究会「強磁場コラボラトリーが拓く未踏計測領域への挑戦と物質・材料科学の最先端」
• [Presentation] 圧力下THz ESR装置の開発と応用 (2016)
  • Author(s): 櫻井敬博
  • Organizer: 分子研研究会「物質および生体機能の起源にせまる先端的電子スピン分光計測」
  • Place of Presentation: 岡崎コンファレンスセンター（愛知県・岡崎市）
  • Year and Date: 2016-12-07
• [Presentation] High pressure THz ESR measurements of spin-gap system KCuCl3 (2016)
  • Author(s): Y. Hirao, E. Ohki, T. Sakurai, H. Ohta, S. Okubo, Y. Uwatoko, and H. Tanaka
  • Organizer: International Workshop “Novel Magnetic Resonance Techniques in Millimeter and Terahertz Waves and their Applications to Bioscience" (MR-THz2016)
  • Place of Presentation: 神戸大学（兵庫県・神戸市）
  • Year and Date: 2016-11-08
  • Int'l Joint Research
• [Presentation] Development of high pressure and high field ESR system and its application to quantum spin system (2016)
  • Author(s): E. Ohki, T. Sakurai, Y. Hirao, S. Okubo, H. Ohta, Y. Uwatoko, H. Tanaka, A. Sera, Y. Kosaka, J. Akimitsu, M. Sera, and K. Inoue
  • Organizer: International Workshop “Novel Magnetic Resonance Techniques in Millimeter and Terahertz Waves and their Applications to Bioscience" (MR-THz2016)
  • Place of Presentation: 神戸大学（兵庫県・神戸市）
  • Year and Date: 2016-11-08
  • Int'l Joint Research
• [Presentation] 強磁場高圧多重極限下ESR装置の開発と応用 (2016)
  • Author(s): 櫻井敬博、平尾祐樹、大木瑛登、太田仁、大久保晋、上床美也、野尻浩之、木村尚次郎
  • Organizer: 第57回高圧討論会
  • Place of Presentation: 筑波大学（茨城県・つくば市）
  • Year and Date: 2016-10-26
• [Presentation] 三角格子反強磁性体CsCuCl3の圧力下THz-ESR測定 (2016)
  • Author(s): 櫻井敬博、大木瑛登、平尾祐樹、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2016年秋季大会
  • Place of Presentation: 金沢大学（石川県・金沢市）
  • Year and Date: 2016-09-13
• [Presentation] High pressure and THz ESR measurement on orthogonal-dimer system SrCu2(BO3)2 (2016)
  • Author(s): T. Sakurai, Y. Hirao, K. Hijii, S. Okubo, H. Ohta, Y. Uwatoko, K. Kudo, Y. Koike
  • Organizer: The 17th International Conference on High Pressure in Semiconductor Physics (HPSP-17) & Workshop on High-pressure Study on Superconducting (WHS)
  • Place of Presentation: 東京大学（東京都・文京区）
  • Year and Date: 2016-08-07
  • Int'l Joint Research
• [Presentation] 多重極限電子スピン共鳴装置の開発と量子スピン系への応用 (2016)
  • Author(s): 櫻井敬博
  • Organizer: 低温工学会関西支部2016年度第1回講演会
  • Place of Presentation: 神戸大学（兵庫県・神戸市）
  • Year and Date: 2016-05-23
  • Invited