Ultrasonic Propagation of a Metallic Domain in Pr0.5Ca0.5CoO3 Undergoing a Photoinduced Insulator-Metal Transition
Ultrasonic Propagation of a Metallic Domain in Pr0.5Ca0.5CoO3 Undergoing a Photoinduced Insulator-Metal Transition
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DOI：
10.1103/physrevlett.103.027402
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发表时间：
2009-07-10
影响因子：
8.6
通讯作者：
Itoh, M.
中科院分区：
文献类型：
--
作者：
Okimoto, Y.;Peng, X.;Itoh, M.
研究了钙钛矿型氧化钴 Pr0.5Ca0.5CoO3 在绝缘体-金属 (I-M) 转变过程中伴随自旋构型变化的飞秒光学响应。在 30 K 光照射后，反射率突然大幅增加，随后随观察到的光子能量而变化。光照射后对 Pr0.5Ca0.5CoO3 麦克斯韦方程的精确计算使我们能够观察 I-M 相变的超快动力学以及光子产生的金属域在超声波速度下的运动。
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.