Publication

Strain modulation of transport criticality in RuO2-based thick-film resistors

Thomas Maeder, Peter Ryser, Claudio Grimaldi, Sonia Vionnet Menot
2004
Journal Articles

Abstract

We show that in RuO2–glass composites the nonuniversal resistivity exponent can be modulated by an applied mechanical strain, signaled by a logarithmic divergence of the piezoresistive response at the percolation threshold. We interpret this phenomenon as being due to a tunneling-distance dependence of the transport exponent, supporting therefore a theory of transport nonuniversality proposed some years ago. © 2004 American Institute of Physics. [DOI: 10.1063/1.1835996]

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https://infoscience.epfl.ch/entities/publication/106b9bec-baf3-4eeb-8fb0-06215946c24b

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Thomas Maeder, Peter Ryser, Claudio Grimaldi, Sonia Vionnet Menot
2004
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/106b9bec-baf3-4eeb-8fb0-06215946c24b

About this result

Related concepts (19)

Percolation theory

In statistical physics and mathematics, percolation theory describes the behavior of a network when nodes or links are added. This is a geometric type of phase transition, since at a critical fraction of addition the network of small, disconnected clusters merge into significantly larger connected, so-called spanning clusters. The applications of percolation theory to materials science and in many other disciplines are discussed here and in the articles Network theory and Percolation (cognitive psychology).

Percolation threshold

The percolation threshold is a mathematical concept in percolation theory that describes the formation of long-range connectivity in random systems. Below the threshold a giant connected component does not exist; while above it, there exists a giant component of the order of system size. In engineering and coffee making, percolation represents the flow of fluids through porous media, but in the mathematics and physics worlds it generally refers to simplified lattice models of random systems or networks (graphs), and the nature of the connectivity in them.

Critical phenomena

In physics, critical phenomena is the collective name associated with the physics of critical points. Most of them stem from the divergence of the correlation length, but also the dynamics slows down. Critical phenomena include scaling relations among different quantities, power-law divergences of some quantities (such as the magnetic susceptibility in the ferromagnetic phase transition) described by critical exponents, universality, fractal behaviour, and ergodicity breaking.

Related publications (1)

Strain modulation of transport criticality in RuO2-based thick-film resistors

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