A model for the V-I characteristics in brick-wall-like structures

An analysis of brick-wall-like structures in high T/sub c/ polycrystalline ceramics with elongated grains is presented in order to predict and explain the voltage-current characteristics in these materials. The current path is determined by two different critical current densities in the direction of the long and short dimensions of the grains. The resistive transition and the n-values are studied in the limit of no longitudinal current transfer by using a statistical analysis of the distribution of the critical currents. This simple case illustrates the different aspects of the problem of modeling the general and more complicated structure.<>