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Experimental evidence for the presence of nonacoustic excitations in molten Ga

AutorBermejo, Francisco Javier ; Bustinduy, Ibón ; Levett, S.J.; Taylor, J.W.; Fernández-Perea, Ricardo ; Cabrillo García, Carlos
Fecha de publicación8-sep-2005
EditorAmerican Physical Society
CitaciónPhysical Review B - Condensed Matter and Materials Physics 72: 104103 (2005)
ResumenThe 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.
Descripción10 págs.; 11 figs.; PACS number s : 61.25.Mv, 61.10.Eq, 63.50. x
Versión del editorhttp://dx.doi.org/10.1103/PhysRevB.72.104103
Identificadoresdoi: 10.1103/PhysRevB.72.104103
issn: 1098-0121
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