A percolation model for the explanation of fractal paraconductivity behavior in a YBaCuO sample

From the fluctuation conductivity behavior, a system information concerning its dimensionality and its change with temperature can be studied. Besides the above characteristics, sometimes, depending on the relations of some c onstants of the material, percolative fractal behavior emerges in the fluct uation behavior. A simple geometrical bond-site percolation model has been used to show that fractal behavior can be understood if we take into accoun t the planar effect of superconductivity. (C) 1999 Elsevier Science B.V. Al l rights reserved.