Resistive transition of (YBa 2Cu 3O 7) 24/(PrBa 2Cu 3O 7) 2 multilayer in high magnetic field

Abstract

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, γ= H ‖ */ H ⊥ *≈15. The magnetic field dependence of the activation energy suggested dimensional crossover in different circumstances, two-dimension (2D) for H‖ c, three-dimension (3D) for H‖ 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.