Ultrafast photoinduced formation of metallic state in a perovskite-type manganite with short range charge and orbital order

Yoichi Okimoto; Hiroyuki Matsuzaki; Yasuhide Tomioka; Istvan Kezsmarki; Takeshi Ogasawara; Masakazu Matsubara; Hiroshi Okamoto; Yoshinori Tokura

doi:10.1143/JPSJ.76.043702

Ultrafast photoinduced formation of metallic state in a perovskite-type manganite with short range charge and orbital order

Yoichi Okimoto, Hiroyuki Matsuzaki, Yasuhide Tomioka, Istvan Kezsmarki, Takeshi Ogasawara, Masakazu Matsubara, Hiroshi Okamoto, Yoshinori Tokura

SCI - Physics

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

Abstract

Femtosecond reflection spectroscopy was performed on a perovskite-type manganite, Gd_0.55Sr_0.45MnO₃, with the short-range charge and orbital order (CO/OO). Immediately after the photoirradiation, a large increase of the reflectivity was detected in the mid-infrared region. The optical conductivity spectrum under photoirradiation obtained from the Kramers-Kronig analyses of the reflectivity changes demonstrates a formation of a metallic state. This suggests that ferromagnetic spin arrangements occur within the time resolution (∼200 fs) through the double exchange interaction, resulting in an ultrafast CO/OO to FM switching.

Original language	English
Article number	043702
Journal	journal of the physical society of japan
Volume	76
Issue number	4
DOIs	https://doi.org/10.1143/JPSJ.76.043702
Publication status	Published - 2007 Apr

Keywords

Optical conductivity
Perovskite-type manganite
Photoinduced phase transition
Ultrafast phenomena

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJ.76.043702

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Ultrafast photoinduced formation of metallic state in a perovskite-type manganite with short range charge and orbital order. / Okimoto, Yoichi; Matsuzaki, Hiroyuki; Tomioka, Yasuhide; Kezsmarki, Istvan; Ogasawara, Takeshi; Matsubara, Masakazu; Okamoto, Hiroshi; Tokura, Yoshinori.

In: journal of the physical society of japan, Vol. 76, No. 4, 043702, 04.2007.

Research output: Contribution to journal › Article › peer-review

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abstract = "Femtosecond reflection spectroscopy was performed on a perovskite-type manganite, Gd0.55Sr0.45MnO3, with the short-range charge and orbital order (CO/OO). Immediately after the photoirradiation, a large increase of the reflectivity was detected in the mid-infrared region. The optical conductivity spectrum under photoirradiation obtained from the Kramers-Kronig analyses of the reflectivity changes demonstrates a formation of a metallic state. This suggests that ferromagnetic spin arrangements occur within the time resolution (∼200 fs) through the double exchange interaction, resulting in an ultrafast CO/OO to FM switching.",

keywords = "Optical conductivity, Perovskite-type manganite, Photoinduced phase transition, Ultrafast phenomena",

author = "Yoichi Okimoto and Hiroyuki Matsuzaki and Yasuhide Tomioka and Istvan Kezsmarki and Takeshi Ogasawara and Masakazu Matsubara and Hiroshi Okamoto and Yoshinori Tokura",

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AU - Okimoto, Yoichi

AU - Matsuzaki, Hiroyuki

AU - Tomioka, Yasuhide

AU - Kezsmarki, Istvan

AU - Ogasawara, Takeshi

AU - Matsubara, Masakazu

AU - Okamoto, Hiroshi

AU - Tokura, Yoshinori

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AB - Femtosecond reflection spectroscopy was performed on a perovskite-type manganite, Gd0.55Sr0.45MnO3, with the short-range charge and orbital order (CO/OO). Immediately after the photoirradiation, a large increase of the reflectivity was detected in the mid-infrared region. The optical conductivity spectrum under photoirradiation obtained from the Kramers-Kronig analyses of the reflectivity changes demonstrates a formation of a metallic state. This suggests that ferromagnetic spin arrangements occur within the time resolution (∼200 fs) through the double exchange interaction, resulting in an ultrafast CO/OO to FM switching.

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KW - Photoinduced phase transition

KW - Ultrafast phenomena

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