Nondiverging vortex pinning barriers at low current densities across the putative elastic vortex-glass-vortex-liquid transition in YBa2Cu3O7-delta films

作者：Miu L^*; Basset M; Jakob G; Rodriguez H; Adrian H

来源：Physical Review B, 2001, 64(22): 220502.

DOI：10.1103/PhysRevB.64.220502

A detailed analysis of the electric field-current density (E - J) characteristics of YBa2Cu3O7-delta films across the putative thermally induced elastic vortex-glass-vortex-liquid transition predicted by the E(J) curve scaling reveals that the expected increase of the collective pinning barriers with decreasing J is cut off in the low-J region, signaling a dissipation process which involves the plastic deformation of the vortex system. The temperature and magnetic field dependence of the pinning barriers at low J does not change across the scaling-predicted glass transition line. For the investigated magnetic field range (0.5-7 T), over a relatively large temperature interval, in YBa2Cu3O7-delta films there appears a continuous crossover in a pinned plastic vortex assembly, rather than a thermally induced elastic vortex-glass-vortex-liquid transition.

• 出版日期2001-12-1