Picosecond dynamics in layered cobalt perovskites studied by time-resolved Raman spectroscopy

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

doi:10.5802/crphys.35

Picosecond dynamics in layered cobalt perovskites studied by time-resolved Raman spectroscopy

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

Comptes Rendus. Physique, Physics of ultra-fast phenomena, Volume 22 (2021) no. S2, pp. 95-102.

Abstract

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 $700 {cm}^{- 1}$ , 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 $2 p$ site to the Co $3 d$ 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.

Online First: 2021-01-14
Published online: 2021-12-03

DOI: 10.5802/crphys.35

Keywords: Spin crossover cobaltite, Perovskite-type oxide, Time-resolved spectroscopy, Raman spectroscopy, Femtosecond technology

Author's affiliations:

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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     author = {Ryo Fukaya and Nao Yamaya and Tadahiko Ishikawa and Shin-ya Koshihara and Yoichi Okimoto and Ken Onda and Akira Isayama and Takao Sasagawa and Kazumasa Horigane},
     title = {Picosecond dynamics in layered cobalt perovskites studied by time-resolved {Raman~spectroscopy}},
     journal = {Comptes Rendus. Physique},
     pages = {95--102},
     publisher = {Acad\'emie des sciences, Paris},
     volume = {22},
     number = {S2},
     year = {2021},
     doi = {10.5802/crphys.35},
     language = {en},
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AU  - Yoichi Okimoto
AU  - Ken Onda
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AU  - Takao Sasagawa
AU  - Kazumasa Horigane
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%A Ryo Fukaya
%A Nao Yamaya
%A Tadahiko Ishikawa
%A Shin-ya Koshihara
%A Yoichi Okimoto
%A Ken Onda
%A Akira Isayama
%A Takao Sasagawa
%A Kazumasa Horigane
%T Picosecond dynamics in layered cobalt perovskites studied by time-resolved Raman spectroscopy
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%R 10.5802/crphys.35
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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, Physics of ultra-fast phenomena, 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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