Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2004-06-11
Langmuir 20, 10756 (2004)
Physics
Condensed Matter
Soft Condensed Matter
LaTeX, 23 pages, 9 eps figures
Scientific paper
We report calculations of the ground state energies and geometries for clusters of different sizes (up to 80 particles), where individual particles interact simultaneously via a short-ranged attractive -modeled with a generalization of the Lennard-Jones potential- and a long-ranged repulsive Yukawa potential. We show that, for specific choices of the parameters of the repulsive potential, the ground state energy per particle has a minimum at a finite cluster size. For these values of the parameters in the thermodynamic limit, at low temperatures and small packing fractions -where clustering is favored and cluster-cluster interactions can be neglected- thermodynamically stable cluster phases can be formed. The analysis of the ground state geometries shows that the spherical shape is marginally stable. In the majority of the studied cases, we find that, above a certain size, ground state clusters preferentially grow almost in one dimension.
Mossa Stefano
Sciortino Francesco
Tartaglia Piero
Zaccarelli Emanuela
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