A Current Induced Transition in atomic-sized contacts of metallic Alloys

Details A Current Induced Transition in atomic-sized contacts of metallic Alloys A Current Induced Transition in atomic-sized contacts of metallic Alloys

2002-09-25

arxiv.org/abs/cond-mat/0209577v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 6 figures

Scientific paper

10.1103/PhysRevB.67.115416

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.

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