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

2017 Fiscal Year Final Research Report

• 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
• Keywords: 共鳴軟X線散乱 / 電子構造 / 光誘起相転移

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.

Free Research Field

遷移金属化合物,電子構造