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• W17493127 abstract "Controlling the electrical resistance of granular thin films is of great importance for many applications, yet a full understanding of electron transport in such films remains a major challenge. We have studied experimentally and by model calculations the temperature dependence of the electrical resistance of ultrathin gold films at temperatures between 2 K and 300 K. Using sputter deposition, the film morphology was varied from a discontinuous film of weakly coupled meandering islands to a continuous film of strongly coupled coalesced islands. In the weak-coupling regime, we compare the regular island array model, the cotunneling model, and the conduction percolation model with our experimental data. We show that the tunnel barriers and the Coulomb blockade energies are important at low temperatures and that the thermal expansion of the substrate and the island resistance affect the resistance at high temperatures. At low temperatures our experimental data show evidence for a transition from electron cotunneling to sequential tunneling but the data can also be interpreted in terms of conduction percolation. The resistivity and temperature coefficient of resistance of the meandering gold islands are found to resemble those of gold nanowires. We derive a simple expression for the temperature at which the resistance changes from non-metal-like behavior into metal-like behavior. In the case of strong island coupling, the total resistance is solely determined by the Ohmic island resistance." @default.
• W17493127 created "2016-06-24" @default.
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• W17493127 date "2011-12-20" @default.
• W17493127 modified "2023-10-06" @default.
• W17493127 title "Effect of Coulomb blockade, gold resistance, and thermal expansion on the electrical resistance of ultrathin gold films" @default.
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• W17493127 doi "https://doi.org/10.1103/physrevb.84.235431" @default.
• W17493127 hasPublicationYear "2011" @default.
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