Nonlinear electrical conductivity in a 1D granular medium

Nonlinear electrical conductivity in a 1 D granular medium

We report on observations of the electrical transport within a chain of metallic beads (slightly oxidised) under an applied stress. A transition from an insulating to a conductive state is observed as the applied current is increased. The voltage-current (U –I) characteristics are nonlinear and hysteretic, and saturate to a low voltage per contact (0.4 V). Our 1D experiment allows us to underst...

Temperature dependence of thermal conductivity in 1D nonlinear lattices

We examine the temperature dependence of thermal conductivity of one dimensional nonlinear (anharmonic) lattices with and without on-site potential. It is found from computer simulation that the heat conductivity depends on temperature via the strength of nonlinearity. Based on this correlation, we make a conjecture in the effective phonon theory that the meanfree-path of the effective phonon i...

Electrical modeling of the influence of medium conductivity on electroporation.

Electroporation is the phenomenon in which cell membrane permeability is increased by exposing the cell to short high electric field pulses. Experimental data show that the amount of permeabilization depends on the conductivity of the extracellular medium. If medium conductivity decreases then it is necessary to deliver a pulse of larger field amplitude in order to achieve the same effect. Mode...

Electrical conductivity in granular media and Branly’s coherer: A simple experiment

Hopping Conductivity in Granular Metals

)Work supported by the National Science Foundation. *Alfred P. Sloan Research Fellow. E. F. Gross, Vsp. Fiz. Nauk 76, 433 (1962), and 103, 431 (1971) [Sov. Phys. Usp. 5, 195 (1962) and 14, 104 {1971)). A. Compaan and H. Z. Cuxnmins, Phys. Rev. B 6, 4753 (1972). Y. Petroff, P. Y. Yu, and Y. B. Shen, Phys. Bev. Lett. 29, 1558 (1972). P. Y. Yu, Y. R. Shen, Y. Petroff, and L. M. Falicov, Phys. Rev....