Vortex Dynamic Properties of Vortex-Liquid Phase in YBa2Cu3O7–δ Epitaxial Films
L. Shan
Department of Physics and National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210008, China
Search for more papers by this authorZ.H. Wang
Department of Physics and National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210008, China
Search for more papers by this authorX.N. Xu
Department of Physics and National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210008, China
Search for more papers by this authorX. Jin
Department of Physics and National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210008, China
Search for more papers by this authorL.J. Shen
Department of Physics and Materials Science, City University of Hong Kong, Hong Kong
Search for more papers by this authorC.C. Lam
Department of Physics and Materials Science, City University of Hong Kong, Hong Kong
Search for more papers by this authorY.S. Chen
Department of Physics and Materials Science, City University of Hong Kong, Hong Kong
Search for more papers by this authorL. Shan
Department of Physics and National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210008, China
Search for more papers by this authorZ.H. Wang
Department of Physics and National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210008, China
Search for more papers by this authorX.N. Xu
Department of Physics and National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210008, China
Search for more papers by this authorX. Jin
Department of Physics and National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210008, China
Search for more papers by this authorL.J. Shen
Department of Physics and Materials Science, City University of Hong Kong, Hong Kong
Search for more papers by this authorC.C. Lam
Department of Physics and Materials Science, City University of Hong Kong, Hong Kong
Search for more papers by this authorY.S. Chen
Department of Physics and Materials Science, City University of Hong Kong, Hong Kong
Search for more papers by this authorAbstract
The current–voltage characteristics (CVC) of YBa2Cu3O7–δ epitaxial films were determined at temperatures and magnetic fields covering the vortex-liquid region. Using functional fitting and scaling method, we derived the temperature and magnetic field dependences of the pinning potential U0(T,H) and critical current density Jc(T,H), and current, temperature and magnetic field dependences of the effective pinning potential Ueff(H,T,J) from the CVC. It is shown that the nonlinear resistance region of the vortex-liquid phase displays a process from vortex plastic motion to free flow with the dynamic exponent changing from –0.5 to 0.
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