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Experimental evidence for the presence of nonacoustic excitations in molten Ga

AuthorsBermejo, Francisco Javier ; Bustinduy, Ibón ; Levett, S.J.; Taylor, J.W.; Fernández-Perea, Ricardo ; Cabrillo García, Carlos
Issue Date8-Sep-2005
PublisherAmerican Physical Society
CitationPhysical Review B - Condensed Matter and Materials Physics 72: 104103 (2005)
AbstractThe nature of the broad band of microscopic excitations measured in molten gallium is investigated by means of analysis of their mode eigenvectors I(Q,ω). The results, derived from neutron spectroscopy experiments, show that excitations with a dominant acoustic character are confined to low energy transfers. In contrast, those appearing at higher frequencies unmistakably exhibit optical character, as evidenced by the out-of-phase relationship shown by the phase of oscillations in I(Q,ω) that become significantly shifted relative to those of the static structure factor. Such effects are shown to arise from partial covalency that is already known to be present in gaseous, cluster and crystalline forms. © 2005 The American Physical Society.
Description10 págs.; 11 figs.; PACS number s : 61.25.Mv, 61.10.Eq, 63.50. x
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.72.104103
Identifiersdoi: 10.1103/PhysRevB.72.104103
issn: 1098-0121
Appears in Collections:(CFMAC-IEM) Artículos
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