Resistive transition of (YBa2Cu3O7)24/(PrBa2Cu3O7)2 multilayer in high magnetic field

The resistive transition of(YBCO)(24)/(PrBCO)(2) multilayer was measured as a function of magnetic field up to 8 T at different fixed angles. It is found that the broadening of the resistive transition was mainly determined by the orientation of magnetic field with respect to the c-axis of multilayer rather than the direction of transport current. The H-T relation showed a strong anisotropy, gamma=H-parallel to*/H-perpendicular to* approximate to 15. The magnetic field dependence of the activation energy suggested dimensional crossover in different circumstances, two-dimension (2D) for H parallel to c, three-dimension (3D) for H parallel to ab. The phenomenon may be attributed to the flux lines that are cut by the insulated PrBCO layers when magnetic field is perpendicular to the ab-plane, and the YBCO layer is in the range of thickness which could induce a dimensional crossover from 3D to 2D. (C) 1998 Elsevier Science B.V. All rights reserved.