Molecular Science
Review
Novel Photo-excited State and Femtosecond Dynamics in Perovskite-type Cobalt Oxides
Yoichi Okimoto
Author information
JOURNALS OPEN ACCESS

Volume 10 (2016) Issue 1 Pages A0088-

Details
Download PDF (1465K) Contact us
Abstract

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.

Information related to the author
© 2016 Japan Society for Molecular Science
Previous article Next article

Recently visited articles
feedback
Top