Plasmons in sodium under pressure: Increasing departure from nearly free-electron behavior

I. Loa, K. Syassen, G. Monaco, G. Vankó, M. Krisch, M. Hanfland

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18 Citations (Scopus)

Abstract

We have measured plasmon energies in Na under high pressure up to 43 GPa using inelastic x-ray scattering (IXS). The momentum-resolved results show clear deviations, growing with increasing pressure, from the predictions for a nearly free-electron metal. Plasmon energy calculations based on first-principles electronic band structures and a quasiclassical plasmon model allow us to identify a pressure-induced increase in the electron-ion interaction and associated changes in the electronic band structure as the origin of these deviations, rather than effects of exchange and correlation. Additional IXS results obtained for K and Rb are addressed briefly.

Original languageEnglish
Article number086402
JournalPhysical review letters
Volume107
Issue number8
DOIs
Publication statusPublished - Aug 16 2011

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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