Dynamics of Atomic Structure
Fluctuation of atomic structures of metal microclusters is observed by using an electron microscope of atomic resolution with a television camera. Such a structural fluctuation is one of the characteristics of microclusters. By using a computer, dynamical properties of small microclusters are studied for the size N = 13 bound by the Lennard-Jones interaction. The coexistence of solid-like and liquid-like phases is pointed out at the effective temperature between those for melting and freezing. On the other hand, for the transition-metal cluster of size N = 6, a fluctuating state accompanying no atomic diffusion is found just below the melting temperature, and a transition to permutation isomers accompanying atomic diffusion just above the melting temperature. Thermal properties of transition-metal microclusters are studied by using Monte-Carlo simulations in both cases of absence and presence of a magnetic interaction. It is observed that a sharp magnetic transition exists even in the small magnetic cluster of size N = 7.
KeywordsArgon Hexagonal Lution Reso Ferro
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- 2.12K. Binder, D. Stauffer: Application of the Monte Carlo Method in Statistical Physics ed. by K. Binder, 2nd edn., Topics Current Phys. Vol.36 (Springer, Berlin, Heidelberg 1987) p.1Google Scholar