Metallic adhesion in atomic-size junctions

Phys Rev Lett. 2004 Sep 10;93(11):116803. doi: 10.1103/PhysRevLett.93.116803. Epub 2004 Sep 10.

Abstract

We report high resolution simultaneous measurements of electrical conductance and force gradient between two sharp gold tips as their separation is varied from the tunneling distance to atomic-size contact. The use of atomically sharp tips minimizes van der Waals interaction, making it possible to identify the short-range metallic adhesion contribution to the total force.