title: Temperature dependence of the polarizability of sodium clusters
abstract: We calculate the static dipole polarizability at finite temperature of sodium clusters of size 8, 20, 40, 55, 93, and 139 using an extended Thomas-Fermi description of the valence electrons. We find polarizabilities at 300 K that are roughly 15% greater than at 0 K, consistent with discrepancies between theoretical polarizabilities at 0 K and measured polarizabilities. We predict that a sharp rise in the polarizability, of about 5%, occurs for sizes of 55 and 139 when the cluster melts, offering the possibility of an alternative method for measuring cluster melting points.
authors.affiliation: Departement de Recherche Fondamentale sur la Matiere Condensee, CEA Grenoble, 17 rue des Martyrs, F-38054 Grenoble Cedex 9, France.
authors.initials: SA
authors.lastname: Blundell
authors.initials: C
authors.lastname: Guet
authors.initials: RR
authors.lastname: Zope