Ultrafast spectral weight transfer in RBaCo2O 6-δ (R=Sm, Gd, and Tb): Role of electronic correlation in a photoinduced phase transition

Y. Okimoto, T. Miyata, M. S. Endo, M. Kurashima, K. Onda, T. Ishikawa, S. Koshihara, M. Lorenc, E. Collet, H. Cailleau, T. Arima

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Abstract

We performed femtosecond reflection spectroscopy on a series of A-site ordered perovskite-type cobalt oxide RBaCo2O6-δ (R=Sm, Gd, and Tb) crystals, in which the electronic transfer was controlled by R. The transient reflectivity and the optical conductivity [σPI(ω)] obtained by a Kramers-Kronig analysis showed an ultrafast change within a time resolution (150 fs) at room temperature and the appearance of signals of a hidden state that were different from the high-temperature metallic state. The transferred spectral weight in σPI(ω) upon photoexcitation sensitively depended on the R species, indicating an important role of electronic correlation in the photoexcited state.

Original languageEnglish
Article number121102
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number12
DOIs
Publication statusPublished - Sep 30 2011
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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