Low temperature conductivity of cermets

A. Gilabert, M. Khatami, S. Berthier, J. Lafait and P. Nédellec

Physica A: Statistical Mechanics and its Applications, 1989, vol. 157, issue 1, 223-229

Abstract: We report on electrical resistivity versus temperature from 50 K down to 1.5 K of Pt Al2O3 and Au Al2O3 cermets. When the metal volume fraction q is below the percolation threshold qc, the dc conductivity shows a temperature dependence of the form ln σ ∝ T−n which is usually related to variable range hopping conduction. When T < T∗ (T∗ ≌4.6 K), the exponent value is n = 14 and above T∗ the temperature dependence is modified with n = 12. This behaviour is not clearly understood and is discussed in view of recent theoretical works. For q≌qc a metallic behaviour is observed at high temperature while at liquid helium temperature a two-dimensional electron-electron interaction effect is invoked to describe the anomalous non-metallic behaviour.

Date: 1989
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:157:y:1989:i:1:p:223-229

DOI: 10.1016/0378-4371(89)90306-3

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