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

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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.

Original languageEnglish
Article number043702
JournalJournal of the Physical Society of Japan
Volume76
Issue number4
DOIs
Publication statusPublished - Apr 1 2007

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Keywords

  • Optical conductivity
  • Perovskite-type manganite
  • Photoinduced phase transition
  • Ultrafast phenomena

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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