Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.043401
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Funding
- Deutsche Forschungsgemeinschaft
- Junta de Castilla y Leon
- Spanish MEC
- European Regional Development Fund [FIS2008-02490/FIS, GR120]
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Caloric curves for sodium clusters with N=139 and 147 atoms show a fine structure near the solid-to-liquid transition. Neither of the two sizes exhibit surface melting. For N=139, diffusion of the surface vacancies is observed, which is not possible in the closed-shell N=147 cluster. A few kelvin above the peak in the heat capacity, N=139 is completely liquid. This is not the case for N=147. Here the inner 13 atoms remain nearly fixed up to several tens of kelvin above the melting temperature of the outer two layers. A simple physical reason is suggested for this unexpected behavior.
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