Abstract
The temperature dependence of the resistivity of an epitaxial (YBa 2Cu 3O 7− δ ) 24/(PrBa 2Cu 3O 7− δ ) 2 multilayer thin film has been measured at low magnetic fields up to 1 T parallel and perpendicular to the c-axis and at a constant field of 0.12 T for various angles. The results show that the PrBCO layers can trap the flux line for H∥ ab and result in two-dimensional (2D) behavior for the tilted field. The activation energy shows a field independent behavior in a field smaller than 0.12 T and a logarithmic field behavior above this field. The angular dependence of the activation energy at H=0.12 T reveals that the dissipation is only related to the perpendicular field component, which is consistent with Kes' 2D pancake model. The coupling and decoupling between the YBCO layers were investigated.
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