title: Ultrasonic propagation of a metallic domain in Pr0.5Ca0.5CoO3 undergoing a photoinduced insulator-metal transition.
abstract: Femtosecond optical response was investigated on a perovskite-type cobalt oxide, Pr0.5Ca0.5CoO3 during an insulator-metal (I-M) transition accompanied with the change in spin configuration. After photoirradiation at 30 K, the reflectivity showed a sudden and large increase with subsequent variation depending on the observed photon energy. An exact calculation of Maxwell's equations for the Pr0.5Ca0.5CoO3 after the photoirradiation enabled us to observe the ultrafast dynamics of I-M phase transition and the motion of the photonically created metallic domain at the velocity of ultrasonic wave.
authors: Department of Materials Science, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan.
authors: Y
authors: Y
authors: Okimoto
authors: X
authors: X
authors: Peng
authors: M
authors: M
authors: Tamura
authors: T
authors: T
authors: Morita
authors: K
authors: K
authors: Onda
authors: T
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authors: Ishikawa
authors: S
authors: S
authors: Koshihara
authors: N
authors: N
authors: Todoroki
authors: T
authors: T
authors: Kyomen
authors: M
authors: M
authors: Itoh