Chin. Phys. Lett.  2014, Vol. 31 Issue (2): 027401    DOI: 10.1088/0256-307X/31/2/027401
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Observation of Dynamic Behavior in YBa2Cu3O7−δ/La0.88Ca0.12MnO3 Using Femtosecond Optical Pulses
PENG Lin1**, CAI Chuan-Bing2, LIU Yong-Sheng1
1Department of Physics, Shanghai University of Electric Power, Shanghai 200090
2Department of Physics, Shanghai University, Shanghai 200444
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PENG Lin, CAI Chuan-Bing, LIU Yong-Sheng 2014 Chin. Phys. Lett. 31 027401
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Abstract

Ultrafast pump-optical probe spectroscopy is used to analyze the carrier dynamic behavior in YBa2Cu3O7−δ/La0.88 Ca0.12MnO3 (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.

Received: 16 October 2013      Published: 28 February 2014
PACS:  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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https://cpl.iphy.ac.cn/10.1088/0256-307X/31/2/027401       OR      https://cpl.iphy.ac.cn/Y2014/V31/I2/027401
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PENG Lin
CAI Chuan-Bing
LIU Yong-Sheng

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