Resistive Transition of Sierpinski Gasket Arrays of Weak Josephson Junctions

Abstract
We present the results of measurements of transport properties of 6th order Sierpinski gasket arrays of weak Josephson junctions. The system shows a broad fluctuation-dominated resistive transition. The temperature dependence of the resistance, however, does not fit the existing theory of fluctuation effects for dimension d=l, d=2, or d=1.585, the fractal dimension of the gasket. The current-voltage characteristics exhibit power-law behavior, but with the exponent varying smoothly with temperature, in contrast to those of 2D arrays. The sample voltage as a function of magnetic field reveals dilation invariance as the field axis is expanded by a factor of 4, reflecting the self-similar geometry of the gaskets.