The ion dynamics of a saturated lithium ammonia solution was investigated by inelastic neutron scattering with optimized resolution. The experimental dispersion curve and mode damping, here carefully probed in a wave-vector range extending well below and above 1 -1, display visible anomalies around 0.8 -1. We relate the dispersion relation anomaly to the shape of the electron gas dielectric function, which screens the ion-ion potential in a way peculiar of the low electron density of the system. The increase of the damping around 0.8 -1 also supports the presence of a new decay channel for the collective excitations. An interpretation of these effects, based on the low electron-density properties of the lithium-ammonia solution, is proposed. © 2011 American Physical Society.

Collective modes in a saturated lithium-ammonia solution as a probe of the response of the low-density homogeneous electron gas / Petrillo, C.; Sacchetti, F.; Guarini, E.; Bove, L. E.; Demmel, F.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 84:9(2011), pp. 1-6. [10.1103/PhysRevB.84.094206]

Collective modes in a saturated lithium-ammonia solution as a probe of the response of the low-density homogeneous electron gas

Sacchetti, F.;Bove, L. E.;
2011

Abstract

The ion dynamics of a saturated lithium ammonia solution was investigated by inelastic neutron scattering with optimized resolution. The experimental dispersion curve and mode damping, here carefully probed in a wave-vector range extending well below and above 1 -1, display visible anomalies around 0.8 -1. We relate the dispersion relation anomaly to the shape of the electron gas dielectric function, which screens the ion-ion potential in a way peculiar of the low electron density of the system. The increase of the damping around 0.8 -1 also supports the presence of a new decay channel for the collective excitations. An interpretation of these effects, based on the low electron-density properties of the lithium-ammonia solution, is proposed. © 2011 American Physical Society.
2011
electronic; optical and magnetic materials; condensed matter physics
01 Pubblicazione su rivista::01a Articolo in rivista
Collective modes in a saturated lithium-ammonia solution as a probe of the response of the low-density homogeneous electron gas / Petrillo, C.; Sacchetti, F.; Guarini, E.; Bove, L. E.; Demmel, F.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 84:9(2011), pp. 1-6. [10.1103/PhysRevB.84.094206]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1195903
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