Femtosecond reflection spectroscopy in La1.5Sr 0.5CoO4

T. Egawa, Y. Okimoto, R. Fukaya, K. Onda, T. Ishikawa, S. Y. Koshihara, A. Isayama, T. Sasagawa

Research output: Contribution to journalArticlepeer-review


Ultrafast optical response has been investigated using fs laser system on a perovskite-type cobalt oxide, La1.5Sr0.5CoO4. After the photoirradiation at room temperature, the time profile of relative change of reflectance (ΔR/R) shows a sudden change within the pulse duration (≈ 150 fs) and decays with a lifetime of ≈ 330 fs. The sign of ΔR/R after the photoexcitation is positive in the mid-infrared region (at 0.50 eV) while negative in the visible energy region (at 2.0 eV), implying photoinduced change of the electronic structure after the photoexcitation.

Original languageEnglish
Pages (from-to)307-309
Number of pages3
JournalActa Physica Polonica A
Issue number2
Publication statusPublished - Feb 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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