Volume 33, Number 4, February I 1996
|Page(s)||279 - 284|
|Section||Condensed matter: structure, thermal and mechanical properties|
|Published online||01 September 2002|
Coulomb staircases and quantum size effects in tunnelling spectroscopy on ligand-stabilized metal clusters
Research Institute for
Materials, University of Nijmegen, Toernooiveld 6525 ED Nijmegen, The
2 Institute for Metal Physics, Accademy of Sciences, 36 Vernadskii str., 252142 Kiev, Ukraine
3 Institüt fur Anorganische Chemie, Universität Essen, Universitätstrasse 5-7, 4300 Essen 1, Germany
Accepted: 17 December 1995
We describe scanning tunnelling spectroscopy results on the ligand-stabilized metal cluster (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.
PACS: 61.16.Ch – Scanning probe microscopy: scanning tunneling, atomic force, magnetic, etc / 73.40.Gk – Tunneling / 73.20.Dx – Electron states in low-dimensional structures (including quantum wells, superlattices, layer structures, and intercalation compounds)
© EDP Sciences, 1996
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