Open AccessEFFECTIVE PINNING POTENTIAL IN EPITAXIAL YBa2Cu3O7-δ THIN FILM
Author(s) -
Zhihe Wang,
Xun Cao,
JingLin Chen,
Kebin Li
Publication year - 1998
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.47.1720
Subject(s) - condensed matter physics , flux pinning , electrical resistivity and conductivity , materials science , pinning force , epitaxy , lattice (music) , thin film , magnetic flux , high temperature superconductivity , magnetic field , critical current , superconductivity , physics , nanotechnology , layer (electronics) , quantum mechanics , acoustics
The temperature dependence of the resistivity of an epitaxial YBa2Cu3O7-δ thin film has been measured in various magnetic fields up to 7T applied parallel to the c-axis near Tc. The result shows that the resistivity below Tc can be well fitted by thermally activation flux motion. The current density dependence of the effective pinning potential follows a logarithmic law proposed by Zeldov et al. The temperature and magnetic field dependence of the effective pinning potential follows U(H,T)=U0(1-T/Tc)H-α, with α=0.63, showing 2D behavior, It is consistent with the plastic deformation model of the flux-line lattice at flux-line-lattice dislocations.