Dynamics of Phonon and fluctuation probed by time-resolved resonant x-ray scattering

• Project/Area Number: 18K03534
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: Tokyo Institute of Technology (2019-2022); The University of Tokyo (2018)
• Principal Investigator: Takubo Kou 東京工業大学, 理学院, 特任助教 (30738365)
• Project Period (FY): 2018-04-01 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: 光誘起ダイナミクス / 光誘起相転移ダイナミクス / 共鳴軟X線散乱 / X線分光 / スピンダイナミクス / 強相関電子系 / 電子線回折 / スピン・軌道揺らぎ / 量子スピン軌道液体 / フォノン

Outline of Final Research Achievements

We have studied an orbital fluctuation dynamics of transition-metal oxide Ba3CuSb2O9 by means of time-resolved resonant soft x-ray scattering. A pre-edge structure originating from oxygen holes is observed at the pre-edge region of the O 1s edge of the x-ray absorption for the hexagonal Ba3CuSb2O9, which realizes the quantum spin and orbital liquid state. Furthermore, a coherent oscillation with a relatively long period around 6 GHz is observed on the photoinduced dynamics of the soft x-ray resonant scattering at the Cu L3 edge, while this coherent oscillation is not realized on the orthorhombic sample that contain a static Jahn-Teller distortion in the Cu sites. These results indicate the presence of oxygen holes in the sample closely relates the quantum spin-orbital entanglement liquid state and can be controlled optical excitation.

Academic Significance and Societal Importance of the Research Achievements

一般の遷移金属化合物の単一サイトの光学フォノンモードはフェムト秒のオーダーであるため、今までのピコ秒領域の時間分解能のX線散乱などの測定では、コヒーレント振動がほとんど観測されることがなかった。量子スピン軌道液体状態が低温で実現するBa3CuSb2O9は複数のCuサイトの自由度が競合する系であり、放射光X線を用いた時間分解型の共鳴軟X線散乱のダイナミクス測定という最先端の手法を用いて、その軌道-スピン揺らぎの状態と密接に関連する数10ps領域のコヒーレントフォノンを観測することに初めて成功した。

Research Products

• [Int'l Joint Research] Helmholtz-Zentrum Berlin (HZB)(ドイツ)
• [Journal Article] Photoinduced transient states of antiferromagnetic orderings in La_1/3Sr_2/3FeO₃ and SrFeO_3-δ thin films observed through time-resolved resonant soft x-ray scattering (2022)
  • Author(s): Yamamoto Kohei、Tsuyama Tomoyuki、Ito Suguru、Takubo Kou、Matsuda Iwao、Pontius Niko、Schussler-Langeheine Christian、Minohara Makoto、Kumigashira Hiroshi、Yamasaki Yuichi、Nakao Hironori、Murakami Youichi、Katase Takayoshi、Kamiya Toshio、Wadati Hiroki
  • Journal Title: New Journal of Physics Volume: 24 Issue: 4 Pages: 043012-043012
  • DOI: 10.1088/1367-2630/ac5f31
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Domain Dependent Fermi Arcs Observed in a Striped Phase Dichalcogenide (2022)
  • Author(s): Takashi Mizokawa, Alexei Barinov, Viktor Kandyba, Alessio Giampietri, Ryoya Matsumoto, Yohei Okamoto, Kou Takubo, Koji Miyamoto, Taichi Okuda, Sunseng Pyon, Hiroyuki Ishii, Kazutaka Kudo, Minoru Nohara, Naurang L. Saini
  • Journal Title: Advanced Qunatum Technologies Volume: 5 Issue: 9 Pages: 202300029-202300029
  • DOI: 10.1002/qute.202200029
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Photo-induced antiferromagnetic-ferromagnetic and spin-state transition in a double-perovskite cobalt oxide thin film (2022)
  • Author(s): Zhang Yujun、Katayama Tsukasa、Chikamatsu Akira、Schussler-Langeheine Christian、Pontius Niko、Hirata Yasuyuki、Takubo Kou、Yamagami Kohei、Ikeda Keisuke、Yamamoto Kohei、Hasegawa Tetsuya、Wadati Hiroki
  • Journal Title: Communications Physics Volume: 5 Issue: 1 Pages: 50-50
  • DOI: 10.1038/s42005-022-00823-4
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Spin-orbital liquid in Ba3CuSb2O9 stabilized by oxygen holes (2021)
  • Author(s): Takubo Kou、Man Huiyuan、Nakatsuji Satoru、Yamamoto Kohei、Zhang Yujun、Hirata Yasuyuki、Wadati Hiroki、Yasui Akira、Mizokawa Takashi、Khomskii Daniel I.
  • Journal Title: Physical Review Materials Volume: 5 Issue: 7 Pages: 1-7
  • DOI: 10.1103/physrevmaterials.5.075002
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] 6-GHz lattice response in a quantum spin-orbital liquid probed by time-resolved resonant x-ray scattering (2021)
  • Author(s): Takubo Kou、Mizokawa Takashi、Man Huiyuan、Yamamoto Kohei、Zhang Yujun、Hirata Yasuyuki、Wadati Hiroki、Khomskii Daniel I.、Nakatsuji Satoru
  • Journal Title: Physical Review B Volume: 104 Issue: 20 Pages: 1-5
  • DOI: 10.1103/physrevb.104.205110
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Vanadium 3d charge and orbital states in V2OPO4 probed by x-ray absorption spectroscopy (2020)
  • Author(s): Murota Kota、Pachoud Elise、Attfield J. Paul、Glaum Robert、Sutarto Ronny、Takubo Kou、Khomskii Daniel I.、Mizokawa Takashi
  • Journal Title: Physical Review B Volume: 101 Issue: 24 Pages: 1-7
  • DOI: 10.1103/physrevb.101.245106
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Hard and soft x-ray photoemission spectroscopy study of the new Kondo system SmO thin film (2020)
  • Author(s): Sakamoto Shoya、Kaminaga Kenichi、Oka Daichi、Yukawa Ryu、Horio Masafumi、Yokoyama Yuichi、Yamamoto Kohei、Takubo Kou、Nonaka Yosuke、Koshiishi Keisuke、Kobayashi Masaki、Tanaka Arata、Yasui Akira、Ikenaga Eiji、Wadati Hiroki、Kumigashira Hiroshi、Fukumura Tomoteru、Fujimori Atsushi
  • Journal Title: Physical Review Materials Volume: 4 Issue: 9 Pages: 1-5
  • DOI: 10.1103/physrevmaterials.4.095001
  • Peer Reviewed
• [Journal Article] Interfacial-hybridization-modified Ir ferromagnetism and electronic structure in LaMnO3/SrIrO3 superlattices (2020)
  • Author(s): Y. Zhang、L. Y. Zheng、L. Wu、M. Suzuki、Q. Zhang、Y. Hirata、K. Yamagami、K. Takubo、K. Ikeda、K. Yamamoto、A. Yasui、N. Kawamura、C. Lin、K. Koshiishi、X. Lin、S. L. Liu、J. Zhang、Y. Hotta、X. R. Wang、A. Fujimori、Y. Lin、C. Nan、L. Shen、H. Wadati
  • Journal Title: Physical Review Research Volume: 2 Issue: 3 Pages: 1-9
  • DOI: 10.1103/physrevresearch.2.033496
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Commensurate versus incommensurate charge ordering near the superconducting dome in Ir1-xPtxTe2 revealed by resonant x-ray scattering (2018)
  • Author(s): Takubo K.、Yamamoto K.、Hirata Y.、Wadati H.、Mizokawa T.、Sutarto R.、He F.、Ishii K.、Yamasaki Y.、Nakao H.、Murakami Y.、Matsuo G.、Ishii H.、Kobayashi M.、Kudo K.、Nohara M.
  • Journal Title: Physical Review B Volume: 97 Issue: 20 Pages: 1-9
  • DOI: 10.1103/physrevb.97.205142
  • Peer Reviewed / Int'l Joint Research
• [Presentation] テーブルトップフェムト秒電子線回折装置の開発 (2022)
  • Author(s): 田久保耕，Samiran Banu，金子水咲，矢嶋渉，羽田真毅，林靖彦，桑原真人，石川忠彦，沖本洋一，腰原伸也
  • Organizer: 2021日本第77回年次大会
• [Presentation] 数十フェムト秒電子線回折装置の開発:シリコン薄膜の光誘起ダイナミクス (2021)
  • Author(s): 田久保耕，Jin Sichen， Samiran Banu，金子水咲，石川忠彦，沖本洋一，腰原伸也，矢嶋渉，羽田真毅， 林靖彦
  • Organizer: 2021日本物理学会秋季大会
• [Presentation] 新同期方式によるフェムト秒電子線回折装置の開発 (2021)
  • Author(s): Jin Sichen, 田久保耕, S. Banu, 金子水咲, 石川忠彦, 沖本洋一, 腰原伸也, 羽田真毅, 林靖彦
  • Organizer: 日本物理学会第76回年次大会
• [Presentation] 光誘起構造ダイナミクス測定のためのテーブルトップフェムト秒時間分解電子線回折装置の開発 (2020)
  • Author(s): 田久保耕, Jin Sichen, 羽田真毅, 東正樹, 林靖彦, 桑原真人, 宮坂等, 石原純夫, 石川忠彦, 沖本洋一, 腰原伸也
  • Organizer: 日本物理学会2020年秋季大会
• [Presentation] Photo-induced dynamics of transition-metal compounds probed by time-resolved resonant soft x-ray scattering and x-ray magnetic circular dichroism (2020)
  • Author(s): K. Takubo, K. Yamamoto, Y. Yokoyama, K. Yamagami, Y. Zhang, Y. Hirata, H. Wadati
  • Organizer: Gordon Research Conference: Ultrafast Phenomena in Cooperative Systems
  • Int'l Joint Research
• [Presentation] 時間分解X線磁気円偏光２色性及び共鳴軟X線散乱による超高速磁気ダイナミクス観測 (2019)
  • Author(s): 田久保耕, 山本航平, 横山優一, Y Zhang, 山神光平, 平田靖透, 関剛斎, 高梨弘毅, H Man, 中辻知, 和達大樹
  • Organizer: 第29回日本MRS年次大会
• [Presentation] 時間分解共鳴軟 X 線散乱によるスピン軌道液体Ba3CuSb2O9の光誘起ダイナミクス測定II (2019)
  • Author(s): 田久保耕, 山本航平, 平田靖透, 和達大樹, Huiyuan Man, 中辻知
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] 時間分解共鳴軟 X 線散乱によるスピン軌道液体Ba3CuSb2O9の光誘起ダイナミクス測定 (2019)
  • Author(s): 田久保耕, 山本航平, 平田靖透, 和達大樹, Huiyuan Man, 中辻知
  • Organizer: 第32回日本放射光学会年会
• [Presentation] Photoinduced dynamics of spin-orbital liquid Ba3CuSb2O9 probed by time-resolved resonant soft x-ray scattering (2018)
  • Author(s): K. Takubo, K. Yamamoto, Y. Hirata, H. Wadati, Huiyuan Man, S. Nakatsuji
  • Organizer: International Workshop on Trends in Advanced Spectroscopy in Materials Science
  • Int'l Joint Research
• [Presentation] 時間分解共鳴軟 X 線散乱によるスピン軌道液体Ba3CuSb2O9の光誘起ダイナミクス測定 (2018)
  • Author(s): 田久保耕, 山本航平, 平田靖透, 和達大樹, Huiyuan Man, 中辻知
  • Organizer: 日本物理学会2018年秋季大会