Effect of bonding of a CO molecule on the conductance of atomic metal wires

Details Effect of bonding of a CO molecule on the conductance of atomic metal wires Effect of bonding of a CO molecule on the conductance of atomic metal wires

2006-10-10

arxiv.org/abs/cond-mat/0610250v1

Physics

Condensed Matter

Materials Science

6 figures

Scientific paper

We have measured the effect of bonding of a CO molecule on the conductance of Au, Cu, Pt, and Ni atomic contacts at 4.2 K. When CO gas is admitted to the metal nano contacts, a conductance feature appears in the conductance histogram near 0.5 of the quantum unit of conductance, for all metals. For Au, the intensity of this fractional conductance feature can be tuned with the bias voltage, and it disappears at high bias voltage (above $\sim$ 200 mV). The bonding of CO to Au appears to be weakest, and associated with monotomic Au wire formation.

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