TY - JOUR
T1 - Ultrafast spectral weight transfer in RBaCo2O 6-δ (R=Sm, Gd, and Tb)
T2 - Role of electronic correlation in a photoinduced phase transition
AU - Okimoto, Y.
AU - Miyata, T.
AU - Endo, M. S.
AU - Kurashima, M.
AU - Onda, K.
AU - Ishikawa, T.
AU - Koshihara, S.
AU - Lorenc, M.
AU - Collet, E.
AU - Cailleau, H.
AU - Arima, T.
PY - 2011/9/30
Y1 - 2011/9/30
N2 - We performed femtosecond reflection spectroscopy on a series of A-site ordered perovskite-type cobalt oxide RBaCo2O6-δ (R=Sm, Gd, and Tb) crystals, in which the electronic transfer was controlled by R. The transient reflectivity and the optical conductivity [σPI(ω)] obtained by a Kramers-Kronig analysis showed an ultrafast change within a time resolution (150 fs) at room temperature and the appearance of signals of a hidden state that were different from the high-temperature metallic state. The transferred spectral weight in σPI(ω) upon photoexcitation sensitively depended on the R species, indicating an important role of electronic correlation in the photoexcited state.
AB - We performed femtosecond reflection spectroscopy on a series of A-site ordered perovskite-type cobalt oxide RBaCo2O6-δ (R=Sm, Gd, and Tb) crystals, in which the electronic transfer was controlled by R. The transient reflectivity and the optical conductivity [σPI(ω)] obtained by a Kramers-Kronig analysis showed an ultrafast change within a time resolution (150 fs) at room temperature and the appearance of signals of a hidden state that were different from the high-temperature metallic state. The transferred spectral weight in σPI(ω) upon photoexcitation sensitively depended on the R species, indicating an important role of electronic correlation in the photoexcited state.
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U2 - 10.1103/PhysRevB.84.121102
DO - 10.1103/PhysRevB.84.121102
M3 - Article
AN - SCOPUS:80053908982
VL - 84
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 1098-0121
IS - 12
M1 - 121102
ER -