Photoinduced Charge-Ordering Fluctuation in Wide-Bandwidth La0.7 Sr0.3 MnO3 Films
WU Da-Jian, WU Xue-Wei, LIU Xiao-Jun
Key Laboratory of Modern Acoustics and Department of Electronic Science and Engineering, Nanjing University, Nanjing 210093
Photoinduced Charge-Ordering Fluctuation in Wide-Bandwidth La0.7 Sr0.3 MnO3 Films
WU Da-Jian;WU Xue-Wei;LIU Xiao-Jun
Key Laboratory of Modern Acoustics and Department of Electronic Science and Engineering, Nanjing University, Nanjing 210093
关键词 ：
75.47.Lx ,
75.90.+w ,
75.47.-m
Abstract ： Photoinduced effects on the transmission and resistivity in wide-bandwidth manganite La0.7 Sr0.3 MnO3 films (TC = 350K) have been investigated at various temperatures in the range of 5--470K by means of the time-resolved pump--probe method. Below TC , we have observed a negative transmission change ΔTM/TM at 2.54eV and a positive resistivity change Delta R/R under photo-irradiation at excited energy Eexc = 3.20eV. With temperature approaching to TC , the values of ΔTM/TM and ΔR/R show a significant reduction. We have ascribed the photoinduced changes on the transmission and resistivity of the La0.7 Sr0.3 MnO3 film to the charge-ordering fluctuation in the ferromagnetic phase, which is similar to that observed in the narrow-bandwidth La0.7 Ca0.3 MnO3 films.
Key words ：
75.47.Lx
75.90.+w
75.47.-m
出版日期: 2006-07-01
:
75.47.Lx
(Magnetic oxides)
75.90.+w
(Other topics in magnetic properties and materials)
75.47.-m
(Magnetotransport phenomena; materials for magnetotransport)
引用本文:
WU Da-Jian;WU Xue-Wei;LIU Xiao-Jun. Photoinduced Charge-Ordering Fluctuation in Wide-Bandwidth La0.7 Sr0.3 MnO3 Films[J]. 中国物理快报, 2006, 23(7): 1903-1906.
0.7 Sr0.3 MnO3 Films. Chin. Phys. Lett., 2006, 23(7): 1903-1906.
链接本文:
https://cpl.iphy.ac.cn/CN/
或
https://cpl.iphy.ac.cn/CN/Y2006/V23/I7/1903
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