Coulomb staircases and quantum size effects in tunnelling spectroscopy on ligand-stabilized metal clusters

J. G.A. Dubois*, J. W. Gerritsen, S. E. Shafranjuk, E. J.G. Boon, G. Schmid, H. Van Kempen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

We describe scanning tunnelling spectroscopy results on the ligand-stabilized metal cluster Pt309Phen*36O30 (where Phen is phenanthrolin) at 4.2 K. If the STM tip is positioned above a single cluster, clear charging effects are observed, varying from a reduction of the current around zero bias (Coulomb blockade) to a stepwise increase of the current as a function of bias voltage (Coulomb staircase). In addition to the regular Coulomb staircase with steps in the current at equal voltage spacing, we observed also staircases whit additional structure. This additional structure can be explained in terms of quantum levels in the cluster.

Original languageEnglish (US)
Pages (from-to)279-284
Number of pages6
JournalEurophysics Letters
Volume33
Issue number4
DOIs
StatePublished - Feb 1 1996
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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