摘要
Ultrafast pump-optical probe spectroscopy is used to analyze the carrier dynamic behavior in YBa2 Cua 07-o/La0.88 Ca0.12Mn03 （YBCO/LCMO） heterostructure. The change in reflectivity AR/R is induced and is probed by us- ing pulses of 12Ors duration and photon energy 1.55eV from a Ti：sapphire laser. For higher laser power fluence （such as 0.5 mJ/cm^2）, the time evolution in transient reflectivity change △R/R exhibits three long relaxation processes. We extract the characteristic relaxation time of the different processes by fitting the data and obtain the long characteristic relaxation time which indicates the enhanced proximity effect of the YBCO/LCMO.
Ultrafast pump-optical probe spectroscopy is used to analyze the carrier dynamic behavior in YBa2 Cua 07-o/La0.88 Ca0.12Mn03 （YBCO/LCMO） heterostructure. The change in reflectivity AR/R is induced and is probed by us- ing pulses of 12Ors duration and photon energy 1.55eV from a Ti：sapphire laser. For higher laser power fluence （such as 0.5 mJ/cm^2）, the time evolution in transient reflectivity change △R/R exhibits three long relaxation processes. We extract the characteristic relaxation time of the different processes by fitting the data and obtain the long characteristic relaxation time which indicates the enhanced proximity effect of the YBCO/LCMO.
基金
Supported by the National Natural Science Foundation of China under Grant No 11374204, the Natural Science Foundation of Shanghai under Grant No 13ZR1417600, the Innovation Program of Shanghai Municipal Education Commission under Grant No 14YZ132, the Science and Technology Commission of Shanghai Municipality under Grant Nos 12JC1404400 and 11160500700, and the Shanghai Science Fund for the Excellent Young Teachers under Grant No Z2012-012.
