Abstract
We have investigated the structural and electrical properties of granular Pd/C as well as granular Au/C thin firms. As revealed by transmission electron microscopy the films consist of small metallic clusters of either Pd or Au embedded within amorphous carbon. Films with low metal volume fraction x consist of structurally isolated clusters and show exponential resistance behavior. Above the so-called percolation threshold x p metallic clusters form a percolating network rendering metallic conductivity. For metallic films with x ≫ x p we observe two dimensional (2d) electronic transport behavior at low temperatures via small additional contributions to the Boltzmann-resistance as arising from weak electron localization (WEL) and enhanced electron-electron interaction (EEI). When approaching the percolation threshold these additional resistance contributions grow in absolute magnitude and the 2d transport behavior changes to 3d-behavior close to x p. For both cases resistance as well as magnetoresistance data can be well explained using theories for WEL and EEI in 2d and 3d respectively.
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