Observation of Dynamic Behavior in YBa2 Cu3 O7−δ /La0.88 Ca0.12 MnO3 Using Femtosecond Optical Pulses
PENG Lin1** , CAI Chuan-Bing2 , LIU Yong-Sheng1
1 Department of Physics, Shanghai University of Electric Power, Shanghai 2000902 Department of Physics, Shanghai University, Shanghai 200444
Abstract ：Ultrafast pump-optical probe spectroscopy is used to analyze the carrier dynamic behavior in YBa2 Cu3 O7−δ /La0.88 Ca0.12 MnO3 (YBCO/LCMO) heterostructure. The change in reflectivity ΔR /R is induced and is probed by using pulses of 120 fs duration and photon energy 1.55 eV from a Ti:sapphire laser. For higher laser power fluence (such as 0.5 mJ/cm2 ), the time evolution in transient reflectivity change ΔR /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.
收稿日期: 2013-10-16
出版日期: 2014-02-28
:
74.25.Gz
(Optical properties)
74.45.+c
(Proximity effects; Andreev reflection; SN and SNS junctions)
74.25.Ha
(Magnetic properties including vortex structures and related phenomena)
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