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We present results of conductance-noise experiments on disordered films ofcrystalline indium oxide with lateral dimensions 2microns to 1mm. Thepower-spectrum of the noise has the usual 1/f form, and its magnitude increaseswith inverse sample-volume down to sample size of 2microns, a behaviorconsistent with un-correlated fluctuators. A colored second spectrum is onlyoccasionally encountered (in samples smaller than 40microns), and the lack ofsystematic dependence of non-Gaussianity on sample parameters persisted down tothe smallest samples studied (2microns). Moreover, it turns out that the degreeof non-Gaussianity exhibits a non-trivial dependence on the bias V used in themeasurements; it initially increases with V then, when the bias is deeper intothe non-linear transport regime it decreases with V. We describe a model thatreproduces the main observed features and argue that such a behavior arisesfrom a non-linear effect inherent to electronic transport in a hopping systemand should be observed whether or not the system is glassy.Comment: 9 figure

Non-Gaussian conductance noise in disordered electronic systems due to a nonlinear mechanism