Real-time Observation of Dynamics of Stronglly Correlated Electron Systems by X-ray Free Electron Laser

• Project/Area Number: 25610089
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: SASAGAWA Takao 東京工業大学, 応用セラミックス研究所, 准教授 (30332597)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2014: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000); Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 強相関電子系 / Ｘ線自由電子レーザー / 時間分解分光 / 電荷スピン秩序 / X線自由電子レーザー

Outline of Final Research Achievements

In order to understand the unusual electronic states emerging in strongly correlated electron systems such as high temperature superconductivity and colossal magneto-resistance, we combined time-resolved femotosecond optical and resonant X-ray diffraction measurements on transition metal compounds having (stripe-type) charge and spin orderings.
We were able to reveal unforeseen photoinduced phase fluctuations of the charge order parameter. Relaxation of the phase fluctuations is found to be an order of magnitude slower than that of the order parameter's amplitude fluctuations, and thus limits charge order recovery. This new aspect of phase fluctuations provides a more holistic view of the phase's importance in ordering phenomena of quantum matter.

Research Products

• [Journal Article] Direct Spectroscopic Evidence for Phase Competition between the Pseudogap and Superconductivity in Bi2Sr2CaCu2O8+d (2015)
  • Author(s): M. Hashimoto, E. A. Nowadnick, R.-H. He, I. M. Vishik, B. Moritz, Y. He, K. Tanaka, R. G. Moore, D. Lu, Y. Yoshida, M. Ishikado, T. Sasagawa, K. Fujita, S. Ishida, S. Uchida, H. Eisaki, Z. Hussain, T. P. Devereaux, and Z.-X. Shen
  • Journal Title: Nature Materials Volume: 14 Issue: 1 Pages: 37-42
  • DOI: 10.1038/nmat4116
  • Peer Reviewed
• [Journal Article] Dynamics of All the Raman-active Coherent Phonons in Sb2Te3 Revealed via Transient Reflectivity (2015)
  • Author(s): K. Norimatsu, M. Hada, S. Yamamoto, T. Sasagawa, M. Kitajima, Y. Kayanuma, K. G. Nakamura
  • Journal Title: J. Appl. Phys. Volume: 117 Issue: 14 Pages: 143102-143102
  • DOI: 10.1063/1.4917384
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Ultrafast Charge Localization in a Stripe-phase Nickelate (2013)
  • Author(s): G. Coslovich, B. Huber, W. -S. Lee, Y. -D. Chuang, Y. Zhu, T. Sasagawa, Z. Hussain, H. A. Bechtel, M. C. Martin, Z. -X. Shen, R. W. Schoenlein, and R. A. Kaindl
  • Journal Title: Nature Communications Volume: 4 Issue: 1
  • DOI: 10.1038/ncomms3643
  • Peer Reviewed
• [Journal Article] Unconventional Photonic Change of Charge-density-wave Phase in Two-leg Ladder Cuprate Sr14Cu24O41 (2013)
  • Author(s): R. Fukaya, Y. Okimoto, M. Kunitomo, T. Ishikawa, K. Onda, S. Koshihara, A. Isayama, and T. Sasagawa
  • Journal Title: J. Phys. Soc. Jpn. Volume: 82 Issue: 8 Pages: 083707-083707
  • DOI: 10.7566/jpsj.82.083707
  • NAID: 210000132680
  • Peer Reviewed
• [Journal Article] Ultrafast Real Space Dynamics of Photoexcited State in a Layered Perovskite-Type Spin Crossover Oxide La_<1.5>Sr_<0.5>CoO_4 (2013)
  • Author(s): Yoichi Okimoto, Tsugumi Egawa, Ryo Fukaya, Yoshitaka Matsubara, Yuki Yamada, Nao Yamada, Tadahiko Ishikawa, Ken Onda, Shin-ya Koshihara, Hiroki Taniguchi, Mitsuru Itoh, Akira Isayama, and Takao Sasagawa
  • Journal Title: Journal of the Physical Society of Japan Volume: vol.82 Issue: 7 Pages: 0747211-8
  • DOI: 10.7566/jpsj.82.074721
  • Peer Reviewed
• [Journal Article] Real-time Manifestation of Strongly Coupled Spin and Charge Order Parameters in Stripe-ordered Nickelates via Time-resolved Resonant X-ray Diffraction (2013)
  • Author(s): Y. D. Chuang, W. S. Lee, T. Sasagawa, Z. X. Shen, et al.
  • Journal Title: Physical Review Letters Volume: 110 Issue: 12
  • DOI: 10.1103/physrevlett.110.127404
  • Peer Reviewed
• [Presentation] 7 fsパルスによる二次元銅酸化物の超高速電荷・スピンダイナミクスの研究 (2015)
  • Author(s): 宮本辰也，大澤尚幸，松井裕太，寺重翼，小野貴晃，矢田祐之，渡部裕也，足立俊輔，伊藤利充，Bingsheng Li，澤彰仁，笹川崇男，岡本博
  • Organizer: 日本物理学会第70回年次大会
  • Place of Presentation: 早稲田大学(東京都新宿区)
  • Year and Date: 2015-03-21 – 2015-03-24
• [Presentation] テラヘルツ波を用いた二次元銅酸化物の電場変調反射分光 (2015)
  • Author(s): 寺重翼，小野貴晃，宮本辰也，森本剛史，矢田祐之，貴田徳明，伊藤利充，笹川崇男，岡本博
  • Organizer: 日本物理学会第70回年次大会
  • Place of Presentation: 早稲田大学(東京都新宿区)
  • Year and Date: 2015-03-21 – 2015-03-24
• [Presentation] 時間分解電子線回折法を用いたトポロジカル絶縁体の光誘起ダイナミクスの観測 (2015)
  • Author(s): 羽田真毅，則松桂，C，Sercan Keskin，鶴田哲也，五十嵐九四朗，笹川崇男，恩田健，萱沼洋輔，R. J. Dwayne Miller，腰原伸也，中村一隆
  • Organizer: 日本物理学会第70回年次大会
  • Place of Presentation: 早稲田大学(東京都新宿区)
  • Year and Date: 2015-03-21 – 2015-03-24
• [Presentation] 時間分解ARPESで研究するBi系銅酸化物高温超伝導体の電子状態 (2015)
  • Author(s): 近藤猛，石田行章，坂本英城，竹内恒博，笹川崇男，辛埴
  • Organizer: 日本物理学会第70回年次大会
  • Place of Presentation: 早稲田大学(東京都新宿区)
  • Year and Date: 2015-03-21 – 2015-03-24
• [Presentation] フェムト秒時間分解電子線回折法の開発：トポロジカル絶縁体の光誘起構造ダイナミクスの観測 (2015)
  • Author(s): 羽田真毅、則松桂、田中誠一、Keskin Sercan、鶴田哲也、五十嵐九四朗、石川忠彦、萱沼 洋輔、Miller R. J. Dwayne、笹川崇男、恩田健、腰原伸也、中村一隆
  • Organizer: 62回応用物理学会春季学術講演会
  • Place of Presentation: 東海大学（神奈川県平塚市)
  • Year and Date: 2015-03-11 – 2015-03-14
• [Presentation] トポロジカル絶縁体Bi2Te3の光励起電子・格子ダイナミクス (2015)
  • Author(s): 則松桂、羽田真毅、鶴田哲也、五十嵐九四郎、田中誠一、恩田健、笹川崇男、中村一隆
  • Organizer: 62回応用物理学会春季学術講演会
  • Place of Presentation: 東海大学（神奈川県平塚市)
  • Year and Date: 2015-03-11 – 2015-03-14
• [Presentation] Nanoscale Charge-order Dynamics in Stripe-phase Nickelates Probed via Ultrafast THz Spectroscopy (2015)
  • Author(s): G. Coslovich, S. Behl, B. Huber, W.-S. Lee, Z.-X. Shen, T. Sasagawa, H. A. Bechtel, M. C. Martin, R. A. Kaindl
  • Organizer: APS March Meeting 2015
  • Place of Presentation: Texas、USA
  • Year and Date: 2015-03-02 – 2015-03-06
• [Presentation] トポロジカル絶縁体Sb2Te3のコヒーレント光学フォノン (2014)
  • Author(s): 則松桂，羽田真毅，山本宗平，笹川崇男，中村一隆
  • Organizer: 第75回応用物理学会秋季学術講演会
  • Place of Presentation: 北海道大学(北海道札幌市)
  • Year and Date: 2014-09-17 – 2014-09-20
• [Presentation] 層状ペロブスカイトCo酸化物における時間分解ラマン分光 (2014)
  • Author(s): 深谷亮、沖本洋一、山谷奈央、田中誠一、恩田健、石川忠彦、腰原伸也、諌山晃、笹川崇男、秋光純、堀金和正
  • Organizer: 日本物理学会第69回年次大会
  • Place of Presentation: 神奈川
• [Presentation] Photo-induced dynamics of strongly coupled charge and spin order parameters (2013)
  • Author(s): W.S. Lee, T. Sasagawa, Z.-X. Shen, Z. Hussain et al.
  • Organizer: Spectroscopy of Novel Superconductors
  • Place of Presentation: Berkeley, USA
• [Remarks] http://www.msl.titech.ac.jp/~sasagawa/index.html
• [Remarks] 東京工業大学応用セラミックス研究所・笹川研究室
  • URL: http://www.msl.titech.ac.jp/~sasagawa/index.html