Abstract
Electrical transport and optical data on amorphous-metal --- rare-gas mixtures of Cs-Xe at 6 K are presented. The Cs-Xe mixtures fit a model whereby most of the Cs is distributed randomly on the microscopic scale while a small amount exists in the form of granular clusters. Although preferential clustering occurs, it is not prominent enough to apply the model of classical percolation theory to the metal-nonmetal transition which is exhibited. The transition is located at 0.55 \ifmmode\pm\else\textpm\fi{} 0.01 Cs atomic fraction based upon the closure of the optical gap and the threshold of extended-state conduction. The composition range over which the states at the Fermi energy are localized is very small or zero.
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