Inhaltszusammenfassung

We measured the dynamic response of the vortex system near the glass transition over an extremely wide electric-field range. Measurement bridges of 0.1-m length patterned from high quality YBa2Cu3O7 films allowed the recording of current-voltage (I-V) curves from 1 V/m down to 10-8V/m. We achieved excellent scaling of the I-V curves. The scaling is corroborated by the analysis of the resistive transitions and the crossover current J0 which limits the critical region of the phase transition. ...We measured the dynamic response of the vortex system near the glass transition over an extremely wide electric-field range. Measurement bridges of 0.1-m length patterned from high quality YBa2Cu3O7 films allowed the recording of current-voltage (I-V) curves from 1 V/m down to 10-8V/m. We achieved excellent scaling of the I-V curves. The scaling is corroborated by the analysis of the resistive transitions and the crossover current J0 which limits the critical region of the phase transition. While our results confirm the qualitative characteristics of a vortex glass phase transition, they yield an increased dynamic critical exponent at all magnetic fields. We also found a considerable dependence of the vortex glass scaling on the electric-field range probed.» weiterlesen» einklappen

Autoren

Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik