Resistance-voltage dependence of nanojunctions during electromigration in ultrahigh vacuum

  title={Resistance-voltage dependence of nanojunctions during electromigration in ultrahigh vacuum},
  author={Dieter Stoffler and Michael Marz and Birgit Kiessig and T. Tomanic and Roland Schafer and Hilbert v. Lohneysen and Regina Hoffmann-Vogel},
  journal={Physical Review B},
The electrical resistance $R$ of metallic nanocontacts subjected to controlled cyclic electromigration in ultrahigh vacuum has been investigated in situ as a function of applied voltage $V$. For sufficiently small contacts, i.e., large resistance, a decrease of $R(V)$ while increasing $V$ is observed. This effect is tentatively attributed to the presence of contacts separated by thin vacuum barriers in parallel to ohmic nanocontacts. Simple model calculations indicate that both thermal… 
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