Plasmons in Sodium under Pressure: Increasing Departure from Nearly-Free-Electron Behavior

Details Plasmons in Sodium under Pressure: Increasing Departure from Nearly-Free-Electron Behavior Plasmons in Sodium under Pressure: Increasing Departure from Nearly-Free-Electron Behavior

2011-04-18

arxiv.org/abs/1104.3486v1

Phys. Rev. Lett. 107, 086402 (2011)

Physics

Condensed Matter

Materials Science

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.107.086402

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 quasi-classical 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.

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