Inhaltszusammenfassung

A detailed analysis of the electric field?current density (E-J) characteristics of YBa2Cu3O7-? 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 ba...A detailed analysis of the electric field?current density (E-J) characteristics of YBa2Cu3O7-? 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-? films there appears a continuous crossover in a pinned plastic vortex assembly, rather than a thermally induced elastic vortex-glass?vortex-liquid transition.» weiterlesen» einklappen

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Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik