Photo-induced dynamics of transition-metal chalcogenide revealed by the time-resolved resonant scattering

• Project/Area Number: 16K20997
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II; Condensed matter physics I
• Research Institution: The University of Tokyo
• Principal Investigator: Takubo Kou 東京大学, 物性研究所, 特任研究員 (30738365)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2016: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 共鳴軟X線散乱 / 電子構造 / 光誘起相転移 / 強相関電子系 / 遷移金属化合物の電子構造 / 光誘起相転移ダイナミクス / 遷移金属化合物 / 強相関電子 / X線磁気円偏光二色性 / 強相関系 / 光物性 / 物性実験 / X線 / 磁性

Outline of Final Research Achievements

We studied the electronic structure of transition-metal chalcogenides exhibiting structural and superconducting transitions by means of resonant soft x-ray scattering (RSXS). In the sturdy of Ir1-xPtxTe2, charge-density-wavelike superstructures with wave vectors of Q = (1/5 0 －1/5), (1/8 0 －1/8), and (1/6 0 －1/6) are observed on the same sample at the lowest temperature, the patterns of which are controlled by the cooling speeds.
In the study of AFe2X3, a ‘separation' (polarization, energy) of the magnetic and orbital orderings at same Q=(1/2,1/2,0) in CsFe2Se3 and BaFe2S3 are observed on the RSXS spectra.
We constructed a time-resolved RSXS and x-ray magneto circular dichroism system at SPring-8 BL-07LSU and observed a photo-induced phase-transition in CsFe2Se3 on the time-resolved RSXS.

Research Products

• [Int'l Joint Research] Canadian Light Source Inc.(カナダ)
• [Int'l Joint Research] Canadian Light Source(Canada)
• [Journal Article] Orbital order and fluctuations in the two-leg ladder materials BaFe 2 X 3 ( X = S and Se) and CsFe 2 Se 3 (2017)
  • Author(s): Kou Takubo, Yuichi Yokoyama, Hiroki Wadati, Shun Iwasaki, Takashi Mizokawa, Teak Boyko, Ronny Sutarto, Feizhou He, Kazuki Hashizume, Satoshi Imaizumi, Takuya Aoyama, Yoshinori Imai, and Kenya Ohgushi
  • Journal Title: Physical Review B Volume: 96 Issue: 11 Pages: 115157-115157
  • DOI: 10.1103/physrevb.96.115157
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Capturing ultrafast magnetic dynamics by time-resolved soft x-ray magnetic circular dichroism (2017)
  • Author(s): Kou Takubo, Kohei Yamamoto, Yasuyuki Hirata, Yuichi Yokoyama, Yuya Kubota, Shingo Yamamoto, Susumu Yamamoto, Iwao Matsuda, Shik Shin, Takeshi Seki, Koki Takanashi, and Hiroki Wadati
  • Journal Title: Appl. Phys. Lett. Volume: １１０ Issue: 16
  • DOI: 10.1063/1.4981769
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 梯子型超伝導体AFe2X3(A=Ba,Cs,X=S,Se)の共鳴軟X線散乱 (2018)
  • Author(s): 田久保耕,山本航平,横山優一,平田靖透,和達大樹,岩崎駿,溝川貴司,Teak Boyko,Ronny Sutarto,Feizoh He,今泉聖司,青山拓也,橋詰和樹,今井良宗,大串研也
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] 梯子型超伝導体BaFe2S3の 共鳴軟X線散乱 (2018)
  • Author(s): 田久保耕,山本航平,横山優一,平田靖透,和達大樹,岩崎駿,溝川貴司,Teak Boyko, Ronny Sutarto, Feizoh He, 今泉聖司, 青山拓也, 橋詰和樹, 今井良宗, 大串研也
  • Organizer: 第31回日本放射光学会年会
• [Presentation] AFe2X3 (A=Ba, Cs, X=S, Se)の電子構造 (2017)
  • Author(s): 田久保耕, 横山優一, 和達大樹, 溝川貴司, Teak Boyko, Ronny Sutarto, Feizoh He, 青山拓也, 橋詰和樹, 大串研也
  • Organizer: 日本物理学会第72回年次大会(2017年)
  • Place of Presentation: 大阪大学(大阪府・豊中市)
  • Year and Date: 2017-03-17
• [Presentation] AFe2X3(A=Ba,Cs,X=S,Se)の電子構造II (2017)
  • Author(s): 田久保耕,横山優一,和達大樹,岩崎駿,溝川貴司,Teak Boyko,Ronny Sutarto,Feizoh He,今泉聖司,青山拓也,橋詰和樹,今井良宗,大串研也
  • Organizer: 日本物理学会秋季大会
• [Presentation] Ir1-xPtxTe2の共鳴X線散乱 II (2016)
  • Author(s): 田久保耕,山本航平,和達大樹,溝川貴司,R. Sutarto,F. He,石井賢司,山崎裕一,中尾裕則, 村上洋一,卞舜生,工藤一貴,松尾元太,石井博文,小林正和,野原実
  • Organizer: 日本物理学会2016秋季大会
  • Place of Presentation: 金沢大学(石川県・金沢市)
  • Year and Date: 2016-09-13