Inhaltszusammenfassung

The complex AC conductivity of YBa2(Cu1?xZnx)3O7 thin films has been investigated in the frequency range 10Hzv 109Hz and for temperatures 10KT300K. The influence of the substrate material on the complex conductivity is studied in detail. In the normal conducting state no intrinsic frequency dependence of the real part of the conductivity ?' could be detected, a finding which excludes a doping-induced localization of the charge carriers in this system. Below Tc, ?'(T) reveals a coherence-like ...The complex AC conductivity of YBa2(Cu1?xZnx)3O7 thin films has been investigated in the frequency range 10Hzv 109Hz and for temperatures 10KT300K. The influence of the substrate material on the complex conductivity is studied in detail. In the normal conducting state no intrinsic frequency dependence of the real part of the conductivity ?' could be detected, a finding which excludes a doping-induced localization of the charge carriers in this system. Below Tc, ?'(T) reveals a coherence-like peak which has been predicted in the framework of the BCS theory. However, we propose that, in the doped superconductors, it is due to a distribution of Tc values. Finally, from the temperature dependence of the imaginary part of the conductivity we determine the T-dependence of the gap. » weiterlesen» einklappen

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Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik