Molecular Science
Review
ペロブスカイト型コバルト酸化物の新しい光励起状態とフェムト秒ダイナミクス
沖本 洋一
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ジャーナル オープンアクセス

10 巻 (2016) 1 号 p. A0088-

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We performed femtosecond reflection spectroscopy on a series of perovskite-type cobalt oxide, RBaCo2O6-δ (R = Sm, Gd, and Tb). The transient reflectivity as well as the optical conductivity just after photoirradiation shows ultrafast change within the time resolution (ca. 120 fs) at room temperature, implying appearance of a hidden state different from the high temperature phase. The transferred spectral weight in the optical conductivity by the photoexcitation sensitively depends on the R-species. i.e., transfer of the d electron. Recent theoretical treatment which quantitatively succeeded in reproducing the transfer dependence of the excited state indicates that the photoirradiation causes locally ferromagnetic state via double-exchange interaction between the injected hole and spins of Co ion, which can be viewed as a novel example of photoinduced phase transition.

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© 2016 分子科学会
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