Acceleration of domain wall movement by photoirradiation in perovskite-type cobaltite
Acceleration of domain wall movement by photoirradiation in perovskite-type cobaltite
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DOI：
10.1103/physrevb.83.161101
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发表时间：
2011-04-13
影响因子：
3.7
通讯作者：
Itoh, M.
中科院分区：
文献类型：
--
作者：
Okimoto, Y.;Kurashima, M.;Itoh, M.
飞秒反射光谱进行钙钛矿型钴氧化物，即，Pr0.5Ca0.5CoO3，经历光诱导的自旋态转变。在30 K的光照射后，反射率变化的时间曲线显示出反映光畴的传播的宽峰（约60个Co位点每一个光子）。峰值位置的分析表明，随着激发强度的增加，传播速度突然增加。这样的加速与增加的通量源于一个突然的声速变化驱动的合作光致结构转变。
Femtosecond reflection spectroscopy was performed on a perovskite-type cobalt oxide, namely, Pr0.5Ca0.5CoO3, that undergoes a photoinduced spin-state transition. After photoirradiation at 30 K, the time profile of the reflectance change shows a broad peak reflecting the propagation of the photodomain (about 60 Co sites per one photon). Analysis of the peak position indicates the sudden increase of the velocity of the propagation with increasing the excitation intensity. Such acceleration with increase in fluence originates from an abrupt sound velocity change driven by a cooperative photoinduced structural transition.