Reportamos el analisis de efectos de fluctuaciones en la conductividad electrica del superconductor Yb0.6Sm0.4Ba2Cu3O7-�Â, a partir de mediciones de resistividad electrica. El analisis, mediante el concepto de la derivada logaritmica del exceso de conductividad con respecto a la temperatura, permitio determinar la ocurrencia de regimenes de fluctuaciones Gaussianas 3D y 2D. En un regimen intermedio se observo un exponente caracteristico de fluctuaciones desarrollandose en un espacio de dimensionalidad fractal. Muy cerca de la temperatura critica Tc se observo un regimen genuinamente critico descrito por el modelo 3D-XY.
We report experiments on conductivity fluctuations in the Yb0.6Sm0.4Ba2Cu3O7-ä superconductor, by using results of resistivity measurements. The analysis was performed by using the temperature logarithmic derivative concept. Gaussian, 3D and 2D, fluctuation regimes was identified near Tc. An intermediate exponent was determined, which was interpreted as a fractal fluctuation regime. Close to Tc a genuine critical regime was identified, which is good described by the 3D-XY model.
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