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Femtosecond Reflection Spectroscopy in La_{1.5}Sr_{0.5}CoO_4

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

Acta Physica Polonica A

2012

vol. 121

issue 2

307-309

Ultrafast optical response has been investigated using fs laser system on a perovskite-type cobalt oxide, La_{1.5}Sr_{0.5}CoO_4. After the photoirradiation at room temperature, the time profile of relative change of reflectance (Δ R/R) shows a sudden change within the pulse duration ( ≈ 150 fs) and decays with a lifetime of ≈ 330 fs. The sign of Δ R/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.

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1 Acta Physica Polonica A

1 2012

1 Egawa T.

1 Fukaya R.

1 Isayama A.

1 Ishikawa T.

1 Koshihara S.

1 Okimoto Y.

1 Onda K.

1 Sasagawa T.

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Femtosecond Reflection Spectroscopy in La_{1.5}Sr_{0.5}CoO_4