Ultrafast dynamics of photoinduced electronic phase modulation in ladder cuprate of Sr14-xCaxCu24O41

R. Fukaya, M. Kunitomo, Y. Okimoto, T. Ishikawa, K. Onda, S. Koshihara, H. Yui, T. Sasagawa

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Abstract

Ultrafast carrier dynamics caused by photoexcitation in quasi-one-dimensional two-leg ladder cuprate Sr4Ca 10Cu24O41 was investigated by the femtosecond reflection spectroscopy. After the photoexcitation along the leg direction, the transient reflectivity changes (ΔR/R) in the mid-infrared region showed instant decrease within 150 fs. The suppressed ΔR/R increased so rapidly on the picosecond time scale that the reflectivity value finally became larger than that in the initial state. Such a successive response in ΔR/R, which was also observed in other photon energy regions, is discussed in terms of ultrafast variation of the Drude weight in the ladder system by the photoirradiation.

Original languageEnglish
Pages (from-to)310-312
Number of pages3
JournalActa Physica Polonica A
Volume121
Issue number2
DOIs
Publication statusPublished - Feb 2012
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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