Berlin 2005 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 50: Critical Phenomena and Phase Transitions

DY 50.6: Vortrag

Mittwoch, 9. März 2005, 11:15–11:30, TU H3010

Surface melting and partial surface melting in metal clusters — •Ralph Werner and Günter Schneider — Institut fuer Theorie der Kondensierten Materie, Universitaet Karlsruhe, 76128 Karlsruhe

We investigate the melting transition of small Al clusters by means of the specific heat and bond length fluctuations determined via canonical Monte-Carlo simulations using many-body Gupta potentials [1]. The determination of the fluctuations of individual bonds reveals that additional atoms in clusters with closed shell structures destabilize the surface, which in turn melts at least partially at very low temperatures. The size dependence of the different signatures of the melting is discussed in detail.

[1] R. Werner, submitted to Eur. Phys. J. B (2004).