Abstract
Cryogenic scanning tunneling microscopy is used to study local electrical-transport properties of thin granular Au/Al2O3 films in the vicinity of the percolation threshold. The current-voltage characteristics are found to vary dramatically from one tip position to another over distances of the order of a few nanometers. These characteristics often exhibit interesting Coulomb-staircase structures having unusual variations in step widths and heights due to complex tunneling paths. A triple-barrier tunnel-junction model accounts quantitatively for the experimental results.
Original language | English |
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Pages (from-to) | 8961-8964 |
Number of pages | 4 |
Journal | Physical Review B |
Volume | 50 |
Issue number | 12 |
DOIs | |
State | Published - 1994 |