ACTA

Photoinduced Phase Transition in Pr_0.5Ca_0.5CoO₃ Studied by Sequential Pulse Excitations

K. Seko^a, Y. Okimoto^a, M. Kurashima^a, R. Fukaya^b, T. Egawa^a, T. Ishikawa^a, K. Onda^c, S.-Y. Koshihara^{a, b}, T. Kyomen^d and M. Itoh^e
^aDepartment of Materials Science, Tokyo Institute of Technology, Megro-ku, Tokyo 152-8551, Japan
^bCREST, JST, Meguro-ku, Tokyo 152-8551, Japan
^cDepartment of Environ. Chem. and Engineering, Tokyo Institute of Technology, Nagatsuta Yokohama, 226-8503, Japan
^dDepartment of Chemistry and Chemical Biology, Gunma Univ., Kiryu, Gunma, 376-8515, Japan
^eMaterials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta Yokohama, 226-8503, Japan

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A perovskite-type cobalt oxide, Pr_0.5Ca_0.5CoO₃ (PCCO), shows photoinduced phase transition. In this study, we successively irradiated two laser pulses with different intensities to PCCO and probed the transient change of the reflection at 2.0 eV. Assuming propagation of the two different photoinduced metallic states, we could reproduce the time profiles as well as the magnitude in the reflectance change, indicating the fabrication of the photoinduced multilayered thin film in Pr_0.5Ca_0.5CoO₃.

DOI: 10.12693/APhysPolA.121.369
PACS numbers: 78.66.-w, 78.47.jg