Designer magnetic superatoms
Author: ["J. Ulises Reveles","Peneé A. Clayborne","Arthur C. Reber","Shiv N. Khanna","Kalpataru Pradhan","Prasenjit Sen","Mark R. Pederson"]
Publication: Nature Chemistry
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Abstract
The quantum states in metal clusters are grouped into bunches of close-lying eigenvalues, termed electronic shells, similar to those of atoms. Filling of the electronic shells with paired electrons results in local minima in energy to give stable species called magic clusters. This led to the realization that selected clusters mimic chemical properties of elemental atoms on the periodic table and can be classified as superatoms. So far the work on superatoms has focused on non-magnetic species. Here we propose a framework for magnetic superatoms by invoking systems that have both localized and delocalized electronic states, in which localized electrons stabilize magnetic moments and filled nearly-free electron shells lead to stable species. An isolated VCs8 and a ligated MnAu24(SH)18 are shown to be such magnetic superatoms. The magnetic superatoms' assemblies could be ideal for molecular electronic devices, as the coupling could be altered by charging or weak fields. Some clusters of atoms, such as Al13−, can behave as though they are themselves atoms. Most of these ‘superatoms’ have filled shells of paired electrons, but calculations now suggest that a vanadium–caesium cluster with a partially filled d-shell acts like manganese, displaying magnetic properties.
Cite this article
Reveles, J., Clayborne, P., Reber, A. et al. Designer magnetic superatoms. Nature Chem 1, 310–315 (2009). https://doi.org/10.1038/nchem.249
