EXPERIMENTAL-DETERMINATION OF THE FLUCTUATIONAL DISSIPATION IN YBA2CU3O7-DELTA UP TO HIGH MAGNETIC-FIELDS

We measure resistive transitions in YBa2Cu3O7-delta for several orient ations and strength of the applied magnetic field. Experiments show th at an angular scaling takes place in the upper part of the transition, for all angles, down to a field-dependent temperature T-f(H). The flu ctuations theory is shown to fully describe the experimental findings for T>T-f, including the angular scaling and the detailed temperature behavior of the resistivity. The scaling breakdown at T-f(H) is argued to be due to pinning effects on vortex lines that become relevant at low temperatures.