Magnetoresistance and percolation in Au-p-(PrBa2Cu3O7)(1-p) composites

Abstract

We examine the transverse magnetoresistance of three-dimensional bicomponent composites Au-p-(PrBa2Cu3O7)(1-p). This property, seldom measured on percolation systems, has been measured below 5 K and up to 1.5 T. Contrarily to well known transport properties, the magnetoresistance of these compounds exhibits a metal volume fraction's threshold pc linked to the onset of disorder rather than to percolation.