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"Magic melters" have geometrical origin.

Kavita Joshi1, Sailaja Krishnamurty, D G Kanhere

  • 1Department of Physics and Center for Modeling and Simulation, University of Pune, Ganeshkhind, Pune-411 007, India.

Physical Review Letters
|May 23, 2006
PubMed
Summary
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Extreme size sensitivity in heat capacities of gallium clusters is linked to their ground state geometry. This finding reveals a generic feature in small clusters, impacting their thermal properties.

Area of Science:

  • Physical Chemistry
  • Materials Science
  • Computational Physics

Background:

  • Experimental studies reveal significant size sensitivity in heat capacities of gallium and aluminum clusters.
  • This phenomenon is particularly pronounced in specific cluster sizes, prompting further investigation.

Purpose of the Study:

  • To investigate the origin of extreme size sensitivity in heat capacities of gallium clusters (Ga30 and Ga31).
  • To explore the relationship between ground state geometry and heat capacity characteristics in small clusters.

Main Methods:

  • Utilized extensive ab initio molecular dynamical simulations.
  • Analyzed the ground state geometries of Ga30 and Ga31 clusters.

Main Results:

Related Experiment Videos

  • Identified the relative order of ground state geometries as the origin of size-sensitive heat capacities in Ga30 and Ga31.
  • Observed a similar effect in small gallium and sodium clusters.

    • Conclusions:

    • The nature of the ground state geometry significantly influences the heat capacity of small clusters.
    • Size sensitivity in heat capacity is a generic characteristic of small metallic clusters.