We have measured conductance histograms of atomic point contacts made from the noble-transition-metal alloys CuNi, AgPd, and AuPt for a concentration ratio of 1:1. For all alloys these histograms at low-bias voltage (below 300 mV) resemble those of the noble metals, whereas at high bias (above 300 mV) they resemble those of the transition metals. We interpret this effect as a change in the composition of the point contact with bias voltage. We discuss possible explanations in terms of electromigration and differential diffusion induced by current heating.
|Pages (from-to)||ID: 115416|
|Number of pages||1|
|Journal||Physical Review B (Condensed Matter)|
|Publication status||Published - Mar 2003|
ASJC Scopus subject areas
- Condensed Matter Physics