Critical behavior of the conductivity of a medium with superconducting inclusions
Demishev S. V., Kosichkin Yu. V., Lunts D. G., Sluchanko N. E., Lyapin A. G.
The critical behavior of the electrical conductivity near the threshold for percolation through the superconducting phase of a conducting medium with superconducting inclusions has been studied. Test samples of amorphous GaSb were used to model this medium. The critical exponent was found to be q = 1. This result can serve as experimental confirmation of the Shklovskii-Efros theory. Deviations from a power law are observed in a narrow region near the percolation threshold. These deviations are apparently caused by weak links between inclusions.