Superconducting behaviour via percolation in Sr(2)RuO(4)-Sr(3)Ru(2)O(7) eutectic crystals

We report on super conducting behavior of Sr(3)Ru(2)O(7) macrodomain taken out from Sr(2)RuO(4)-Sr(3)Ru(2)O(7) eutectic crystals. Transport measurements performed down to 300 mK provide evidence of a supercurrent owing through the whole sample. Structural and compositional analyses are used to estimate the percentage of possible Sr(2)RuO(4) inclusions. On the base of a model that describes the system as a proximity network made of superconducting Sr(2)RuO(4) grains dispersed in the normal Sr(3)Ru(2)O(7) matrix we determine the conditions for having a percolating superflow through the system.