Capacitances of magic Fe13O8 cluster, Fe, Co, Ni, and Au clusters are calculated. As they have the order of aF (1 aF = 1×10-18F), it is expected that the mono-electron phenomena (such as Coulomb gap, Coulomb staircase and negative differential resistance) can be displayed at room temperature for these clusters. The capacitance is found to be an increasing function of the cluster size but not monotonous. Some oscillations exist especially for Fe and Co clusters.
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