Physics – Condensed Matter – Materials Science
Scientific paper
2008-02-17
Phys Rev Lett 100, 245501 (2008)
Physics
Condensed Matter
Materials Science
4 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.100.245501
Two exponents, $\delta$, for size distribution of $n$-atom clusters, $Y(n)\sim n^{-\delta}$, have been found in Au clusters sputtered from embedded Au nanoparticles under swift heavy ion irradiation. For small clusters, below 12.5 nm in size, $\delta$ has been found to be 3/2, which can be rationalized as occurring from a steady state aggregation process with size independent aggregation. For larger clusters, a $\delta$ value of 7/2 is suggested, which might come from a dynamical transition to another steady state where aggregation and evaporation rates are size dependent. In the present case, the observed decay exponents do not support any possibility of a thermodynamic liquid-gas type phase transition taking place, resulting in cluster formation.
Ghatak Jay
Joseph Bill
Kanjilal D.
Kuiri P. K.
Lenka H. P.
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