Ultrafast laser induced conductive and resistive transients in La 0.7 Ca 0.3 MnO 3 : charge transfer and relaxation dynamics
Ultrafast laser induced conductive and resistive transients in La 0.7 Ca 0.3 MnO 3 : charge transfer and relaxation dynamics
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DOI：
10.1103/physrevlett.81.1310
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发表时间：
1998-08
影响因子：
8.6
通讯作者：
Yonggang Zhao;Junwen Li;R. Shreekala;H. Drew;C. Chen;W. Cao;Chi H. Lee;M. Rajeswari;S. Ogale;R. Ramesh;G. Baskaran;T. Venkatesan
中科院分区：
文献类型：
--
作者：
Yonggang Zhao;Junwen Li;R. Shreekala;H. Drew;C. Chen;W. Cao;Chi H. Lee;M. Rajeswari;S. Ogale;R. Ramesh;G. Baskaran;T. Venkatesan
在皮秒时间尺度上研究了脉冲激光激发诱导巨磁阻材料la0.7 Ca 0.3 mno3电导的变化。双分量信号由与顺磁绝缘状态相关的快正瞬态和与铁磁金属状态相关的慢负信号组成。快分量对应于简-泰勒小极化子的光电离。由于光产生的磁激发，载流子迁移率降低，从而解释了慢分量。
Pulsed laser excitation induced conductance changes in colossal magnetoresistance material La 0.7 Ca 0.3 MnO 3 were studied on the picosecond time scale. A two-component signal was seen consisting of a fast positive transient associated with the paramagnetic insulating state and a slower negative signal associated with the ferromagnetic metallic state. The fast component corresponds to the photoionization of the Jahn-Teller small polaron. The slow component is explained in terms of the reduced carrier mobility due to photogenerated magnetic excitations.