NonlinearI-Vcharacteristics near the percolation threshold
- 1 October 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 44 (13), 6773-6779
- https://doi.org/10.1103/physrevb.44.6773
Abstract
The I-V characteristics of a carbon-wax mixture slightly above the percolation threshold are found to be nonlinear. Generally for low (linear) -resistance samples, the I-V curves are smooth. The leading nonlinear term is quadratic, rather than cubic. For high-resistance samples, the onset of nonlinearity is marked by the appearance of resonance like structures in the R-V curves. The current at which nonlinearity starts scales with the linear conductance as ∼, with x≊1.4 in both cases. The second-order conductance, , in the case of smooth curves, also scales with as ∼, with y≊0.59. Results are discussed within the framework of two previously suggested models. It is shown that none of these models can explain fully results obtained with the carbon-wax system.
Keywords
This publication has 37 references indexed in Scilit:
- Enhancement in nonlinear effects in percolating nonlinear resistor networksPhysical Review B, 1990
- Nonlinear susceptibilities of granular matterPhysical Review B, 1988
- Crossover from linear to nonlinear resistance near percolationPhysical Review Letters, 1987
- Resistance noise in nonlinear resistor networksPhysical Review Letters, 1987
- Nonlinear Behavior near the Percolation Metal-Insulator TransitionPhysical Review Letters, 1986
- A connection between linear and nonlinear resistor networksJournal of Physics A: General Physics, 1985
- Nonlinear resistor fractal networks, topological distances, singly connected bonds and fluctuationsJournal of Physics A: General Physics, 1985
- Conduction in random networks on super-normal conductors: geometrical interpretation and enhancement of nonlinearityJournal of Physics A: General Physics, 1984
- Percolation theory for nonlinear conductorsPhysical Review B, 1984
- Percolation Theory of Nonlinear Circuit ElementsPhysical Review Letters, 1982