High resolution inelastic neutron scattering measurements on a wide class of liquid metals are reported. The driving role of the electron density in the propagation and decay of collective excitations is emphasized. A quantitative relation between the anomalous sound velocity dispersion in liquid metals and the screening of the ionic potential due to the electron gas is found. In particular, a scaling law of the dispersion curves in heavy alkali metals is obtained by applying the Bohm–Staver (BS) model for the ion plasma. Furthermore, a unified description of the alkali and polyvalent metals dynamics is achieved by means of the introduction of electron correlation and ionic size effects.
High frequency dynamics of liquid metals
PETRILLO, Caterina;SACCHETTI, Francesco
2006
Abstract
High resolution inelastic neutron scattering measurements on a wide class of liquid metals are reported. The driving role of the electron density in the propagation and decay of collective excitations is emphasized. A quantitative relation between the anomalous sound velocity dispersion in liquid metals and the screening of the ionic potential due to the electron gas is found. In particular, a scaling law of the dispersion curves in heavy alkali metals is obtained by applying the Bohm–Staver (BS) model for the ion plasma. Furthermore, a unified description of the alkali and polyvalent metals dynamics is achieved by means of the introduction of electron correlation and ionic size effects.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
