# 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.

Autor: Yan-Fang Wei; Zhi-Qing Li

Fuente: https://archive.org/