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Does the melting behavior in ultrathin metallic nanowires begin from the surface ?

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arxiv cond-mat/0201143 v1 pith:Q7ASB4I7 submitted 2002-01-09 cond-mat.mtrl-sci

classification cond-mat.mtrl-sci
keywords meltingnanowiressurfacegoldinteriortemperaturelowerultrathin
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Surface melting temperature is well-known significantly lower than the bulk melting point. But we find that the interior melting temperature in ultrathin nanowires is lower than that of the surface melting . The thermal stability of helical multi-walled cylindrical gold nanowires is studied using molecular dynamics simulations. The melting temperature of gold nanowires is lower than the bulk value, but higher than that of gold nanoclusters. An interesting interior melting is revealed in the gold nanowires and the thermodynamics is closely related to interior structures. The melting starts from the interior atoms, while the surface melting occurs at relatively higher temperature. We propose that the surface melting represents the overall melting in ultrathin metallic nanowires.

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