Comptes Rendus
Picosecond dynamics in layered cobalt perovskites studied by time-resolved Raman spectroscopy
Comptes Rendus. Physique, Volume 22 (2021) no. S2, pp. 95-102.

Picosecond dynamics of the photoexcited charge-ordered perovskite-type cobalt oxides La 1.5 Ca 0.5 CoO 4 and La 1.5 Sr 0.5 CoO 4 were investigated based on time-resolved Raman and reflection spectroscopy. These cobalt oxides show strong Raman scattering at around 700cm -1 , originating from the breathing vibration mode of the CoO 6 octahedron coupled with the checkerboard-type charge ordering of Co 2+ and Co 3+ . We performed time-resolved Raman and reflection spectroscopy by photoirradiating with picosecond pulses at 400 nm, exciting the charge transfer (CT) transition from the O 2p site to the Co 3d site. As a result of the excitation, the Raman intensity of the breathing mode was suppressed by 10% on a similar time scale in the reflectance change without changing the frequency of the mode, directly indicating ultrafast suppression of the order parameter of the charge-ordered state by CT transition.

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DOI: 10.5802/crphys.35
Keywords: Spin crossover cobaltite, Perovskite-type oxide, Time-resolved spectroscopy, Raman spectroscopy, Femtosecond technology

Ryo Fukaya 1; Nao Yamaya 1; Tadahiko Ishikawa 1; Shin-ya Koshihara 1; Yoichi Okimoto 1; Ken Onda 2; Akira Isayama 3; Takao Sasagawa 3; Kazumasa Horigane 4

1 Department of Chemistry, Tokyo Institute of Technology, 2-12-1, Ookayama, Tokyo, 152-8551, Japan
2 Department of Chemistry, Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan
3 Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503, Japan
4 Research Institute for Interdisciplinary Science, Okayama University, 3-1-1, Tsushimanaka, Okayama, 700-8530, Japan
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights
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     title = {Picosecond dynamics in layered cobalt perovskites studied by time-resolved {Raman~spectroscopy}},
     journal = {Comptes Rendus. Physique},
     pages = {95--102},
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Ryo Fukaya; Nao Yamaya; Tadahiko Ishikawa; Shin-ya Koshihara; Yoichi Okimoto; Ken Onda; Akira Isayama; Takao Sasagawa; Kazumasa Horigane. Picosecond dynamics in layered cobalt perovskites studied by time-resolved Raman spectroscopy. Comptes Rendus. Physique, Volume 22 (2021) no. S2, pp. 95-102. doi : 10.5802/crphys.35. https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.35/

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