Observation of double percolation transitions in Ag-SnO$ 2$ nanogranular filmsReport as inadecuate



 Observation of double percolation transitions in Ag-SnO$ 2$ nanogranular films


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Two percolation transitions are observed in Ag$ x$SnO$ 2 {1-x}$ nanogranular films with Ag volume fraction $x$ ranging from $\sim$0.2 to $\sim$0.9. In the vicinity of each percolation threshold $x {ci}$ $i$$=$1, 2, the variation in $\sigma$ with $x$ obeys a power law for $x$$$$x {ci}$. The origin of the first percolation transition at $x {c1}$ $x {c1}$$$$x {c2}$ is similar to that of the classical one, while the second transition is explained as originating from the tunneling to the second-nearest neighboring Ag particles. These observations provide strong experimental support for the validity of current theories concerning tunneling effect in conductor-insulator nanogranular composites.



Author: Yan-Fang Wei; Zhi-Qing Li

Source: https://archive.org/



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