Conductance histograms of work-hardened Al show a series up to 11 equidistant peaks with a period of 1.15 ±0.02 of the quantum conductance unit G_0=2e~2/h. Assuming that the peaks originate from atomic discreteness, this agrees with the value of 1.16 G_0 per atom obtained in numerical calculations by Hasmy et al. [Phys. Rev. B 72, 245405 (2005)].
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