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Core-melted clusters

  • D. V. Anghel
  • M. Manninen
Conference paper

Abstract

The possibility of the existence of a core-melted cluster is investigated. To this end, a pair potential is introduced, with the property that the solid state of the cluster is less dense than the liquid state. With this kind of potential, the cluster exhibits a quite unusual behavior. In addition to the known states, solid, liquid, and surface-melted, it can also be found in a “dense-liquid” phase (a disordered state appearing at low temperatures), a “core-melted” phase, and a “core-surface-melted” phase. In the core-melted phase, the external part of the cluster consists of atoms that are vibrating around regular crystalline sites, while the core atoms have much bigger mobility, sometimes exhibiting a diffusive motion. The phase diagrams for different parameters that enter in the model potential are analyzed.

PACS

36.40.Ei Phase transitions in clusters 36.90.+f Other special atoms, molecules, ions, and clusters 36.40.-c Atomic and molecular clusters 

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References

  1. 1.
    R.S. Berry: Phases and Phase Changes of Clusters, in Large Clusters of Atoms and Molecules, ed. by T.P. Martin ( Kluwer, Dordrecht 1996 ) pp. 281–295CrossRefGoogle Scholar
  2. 2.
    M.P. Allen, D.J. Tildesley: Computer simulations of liquids (Oxford University Press, New York 1990)Google Scholar

Copyright information

© Springer-Verlag Italia 1999

Authors and Affiliations

  • D. V. Anghel
    • 1
    • 2
  • M. Manninen
    • 1
  1. 1.Department of PhysicsUniversity of JyväskyläJyväskyläFinland
  2. 2.National Institute for Physics and Nuclear Engineering — “Horia Hulubei”Bucharest-MagureleRomania

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