Anomalous hopping exponents of ultrathin metal films

Authors
Markovic, N Christiansen, C Grupp, DE Mack, AM Martinez-Arizala, G Goldman, AM
Citation
N. Markovic et al., Anomalous hopping exponents of ultrathin metal films, PHYS REV B, 62(3), 2000, pp. 2195-2200
Citations number
27
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
62
Issue
3
Year of publication
2000
Pages
2195 - 2200
Database
ISI
SICI code
0163-1829(20000715)62:3<2195:AHEOUM>2.0.ZU;2-X
Abstract
The temperature dependence of the resistance R (T) of ultrathin quench-cond ensed films of Ag, Bi, Pb, and Pd has been investigated. In the most resist ive films, R (T) = R-0 exp(T-0 /T)(x), where x = 0.75 +/- 0.05. Surprisingl y, the exponent x was found to be constant for a wide range of Ro and To in all four materials, possibly implying a consistent underlying conduction m echanism. The results are discussed in terms of several different models of hopping conduction.