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Segregation process in a cluster of cobalt atoms (red spheres) and carbon atoms (blue spheres) as the temperature drops from 2000 K, (a), to 1500 K, (c), showing the migration of the cobalt atoms to the center. [J. Gavillet, A. Loiseau, C. Journet, F. Willaime, F. Ducastelle, and J.-C. Charlier, Phys. Rev. Lett. 87, 275504 (2001)]

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