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The conductance of a single-atom contact is sensitive to the coupling of thiscontact atom to the atoms in the leads. Notably for the transition metals thisgives rise to a considerable spread in the observed conductance values. Themean conductance value and spread can be obtained from the first peak inconductance histograms recorded from a large set of contact-breaking cycles. Incontrast to the monovalent metals, this mean value for Pt depends strongly onthe applied voltage bias and other experimental conditions, ranging from about1 to 2.5 times 2e^2/h. We propose that the different results in part can beexplained by the inclusion of hydrogen in the contacts. The bias dependence ofthe conductance is on the other hand due to the electron current thatdestabilizes monatomic Pt chains at high bias.Comment: 4 pages, 4 figure

Conductance of single-atom platinum contacts: Voltage dependence of the conductance histogram