Study on the Dimensionality of Flux Dynamics in Superconducting YBCO/PYBCO Superlattices

S. Y. Yang ； J. T. Jeng ； H. E. Horng ； H. C. Yang

《Chinese Journal of Physics》 36卷2S期 (1998/04) Pp. 254-261

並列摘要

Angular dependent critical current densities for superconducting YBa2Cu3O7-y/ Pr0.5Y0.5Ba2Cu3O7-y superlattices and a pure YBa2Cu3O7-y thin film were measured to investigate the influence of temperature, thickness of each YBa2Cu3O7-y layer and the applied magnetic filed on the dimensionality of flux dynamics (DFD). It was found that the DFD in the superlattice (48Å/24Å) x20 exhibits a 2D behavior at t = 0.65, but that it deviates from the 2D behavior as t = 0.92. By increasing the thickness of each YBa2Cu3O7-y layer from 48 Å to 120Å, the DFD becomes closer to 2D at t = 0.92 under H = 0.1 T. The DFD in the superlattice (120Å /24Å) x8 exhibits a 2D behavior at t = 0.92 if the ab-plane component of applied magnetic field Hab is smaller than 1 T, but it deviates from 2D if Hab is larger than 1 T. The flux mechanics are discussed.