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• W2019926761 abstract "Abstract Two transition concentrations of the conducting component in RuO2-glass films are defined. The first is identified with the classical percolation threshold νc and its value has been found as lying usually in the range 0.02–;0.04. At the second, denoted νq, the temperature coefficient of resistance, measured at room temperature, changes its sign and its is found that percolation νq is most often between 0.12 and 0.16. The relatively small value of νc is interpreted within the framework of a model including segregation. A segregation coefficient is defined as particle size ratio χ = D/d of the glass and RuO2 particle mean diameters D and d, respectively, with χ ranging from 10 to 150. Our computer simulation results νc(χ = 1)≅0.16 and νc(χ = ∞)≅0.02 agree with the literature data for uncorrelated site-percolation and random-void models, respectively. The transition observed at νq is interpreted as quantum percolation threshold, separating a system with localized states for ν q. This is illustrated by results of numerical studies of the dimensionless conductance g in a quantum percolation model; the calculations are made using Landauer-Buttiker formula and a Green's function method. Studies of conductance versus temperature characteristics from 4.2 to 300 K show G = a + bTy low-temperature behaviour with y≅0.33 for compositions below and above νq but close to it. An interpretation of this behaviour is given within a localization/delocalization picture assuming that inelastic scattering processes play a dominant role in the transport properties. Other approaches like those based on electron-electron interaction effects and hopping conduction are also discussed." @default.
• W2019926761 created "2016-06-24" @default.
• W2019926761 creator A5026736024 @default.
• W2019926761 date "1997-09-01" @default.
• W2019926761 modified "2023-10-16" @default.
• W2019926761 title "Classical percolation threshold and resistance versus temperature behaviour of RuO2-glass films" @default.
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• W2019926761 doi "https://doi.org/10.1016/s0921-4526(97)00426-2" @default.
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