Inhaltszusammenfassung

We determined the Berezinskii-Kosterlitz-Thouless transition temperature TKT at the superconducting layer level and the mean-field critical temperature Tc0 in oxygen-deficient YBa2Cu3Oy films (y?6.5, 6.55, and 6.65). We used the T dependence of the quasi-two-dimensional I-V exponent for T?TKT, and the analysis of the resistive transition in the framework of the Ginzburg-Landau two-dimensional Coulomb gas model for T>TKT. Both procedures give essentially the same results, with Tc0 remaining in...We determined the Berezinskii-Kosterlitz-Thouless transition temperature TKT at the superconducting layer level and the mean-field critical temperature Tc0 in oxygen-deficient YBa2Cu3Oy films (y?6.5, 6.55, and 6.65). We used the T dependence of the quasi-two-dimensional I-V exponent for T?TKT, and the analysis of the resistive transition in the framework of the Ginzburg-Landau two-dimensional Coulomb gas model for T>TKT. Both procedures give essentially the same results, with Tc0 remaining in the domain of the electrical resistivity drop. » weiterlesen» einklappen

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Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik