Inhaltszusammenfassung

In-plane current-voltage (I-V) characteristics of high-temperature superconductors in a zero applied magnetic field exhibit intrinsic two-dimensional (2D) behavior at relatively high transport-current densities. This allowed us an accurate determination of the temperature variation of the zero-field I-V exponent a(T) (V?Ia) at the superconducting (CuO2)2 layer level in the case of highly anisotropic Bi2Sr2CaCu2O8 ? films in the vicinity of the Kosterlitz-Thouless-Berezinskii transition temper...In-plane current-voltage (I-V) characteristics of high-temperature superconductors in a zero applied magnetic field exhibit intrinsic two-dimensional (2D) behavior at relatively high transport-current densities. This allowed us an accurate determination of the temperature variation of the zero-field I-V exponent a(T) (V?Ia) at the superconducting (CuO2)2 layer level in the case of highly anisotropic Bi2Sr2CaCu2O8 ? films in the vicinity of the Kosterlitz-Thouless-Berezinskii transition temperature TKT. The mean-field critical temperature and TKT were determined from the zero-field resistive transition in the framework of the 2D Coulomb gas model. It was found that a(TKT)?3, pointing toward a dynamic critical exponent z(TKT)=2. The a(T) dependence observed by us is in good agreement with Langevin simulations of the 2D Coulomb gas model.» weiterlesen» einklappen

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Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik