Low-temperature transport properties of granular Pb films below the percolation threshold

A. Gerber*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The author studies the transport properties of disconnected Pb films from 77 down to 0.05 K, at zero and high applied magnetic fields. The conductivity between separated metal clusters is found to be dominated by voltage injection and not by thermal excitation of electrons at low temperatures. This explains temperature-independent resistance tails in both the superconductivity and the normal state of the films, observed at low temperatures in this and in other experiments. I-V characteristics were found to follow a power law I varies as Vn, n>2, at low temperatures, consistent with a space-charge-limited current model for the conductivity.

Original languageEnglish
Article number004
Pages (from-to)8161-8172
Number of pages12
JournalJournal of Physics Condensed Matter
Issue number41
StatePublished - 1990
Externally publishedYes


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