Sub-picosecond photo-induced melting of a charge-ordered state in a perovskite manganite
Sub-picosecond photo-induced melting of a charge-ordered state in a perovskite manganite
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DOI：
10.1007/s003400000338
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发表时间：
2000-08
期刊：
影响因子：
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通讯作者：
M. Fiebig;K. Miyano;Y. Tomioka;Y. Tokura
中科院分区：
文献类型：
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作者：
M. Fiebig;K. Miyano;Y. Tomioka;Y. Tokura
在光照射的巨磁阻化合物Pr0.7Ca0.3MnO3中观察到电荷有序态的超快熔化。泵浦-探针光谱实验表明，在小于1ps时形成具有典型绝缘体-金属跃迁（IMT）特征的导电相，该相是亚稳的，除非在电场作用下持续稳定到路状金属区，否则该相可以维持约1 μs。虽然激光诱导的晶格加热可能在初始激发中起作用，但电子相关是导致在电荷有序态击穿后形成金属态的主要效应。
Ultrafast melting of a charge-ordered state has been observed in the photo-irradiated colossal magnetoresistive compound Pr0.7Ca0.3MnO3. Pump-and-probe spectroscopy experiments reveal the formation of a conducting phase with typical features of an insulator–metal transition (IMT) after less than 1 ps. This phase is metastable and can be maintained for about 1 μs unless it is stabilized persistently into a pathlike metallic region by an electric field. Although laser-induced lattice heating may play a role in the initial excitation, electronic correlations are the dominant effect which leads to the formation of the metallic state upon the breakdown of the charge-ordered state.