Piezoresistive anisotropy of percolative granular metals

TL;DR

This paper investigates how the piezoresistive anisotropy in granular metals varies near the percolation threshold, revealing a power law behavior and proposing a relation useful for real materials like thick film resistors.

Contribution

It introduces a simple relation between conductance and piezoresistive anisotropy, highlighting its critical behavior near the percolation threshold in granular metals.

Findings

Piezoresistive anisotropy decreases near the percolation threshold following a power law.

A relation between conductance and anisotropy is proposed for practical applications.

The behavior is relevant for materials like thick film resistors.

Abstract

The piezoresistive response of granular metals under uniaxial strain is strongly dependent on the concentration of the conducting phase. Here we show that the piezoresistive anisotropy is reduced as the system approaches its percolation thresold, following a power law behavior in the critical region. We propose a simple relation between the conductance and the piezoresistive anisotropy which could be used in relation to real materials and notably to the thick film resistors.