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

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

Research output: Contribution to journalArticle

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

Fingerprint

x ray scattering
plasmons
free electrons
inelastic scattering
sodium
deviation
electronics
momentum
energy
predictions
metals
ions
electrons
interactions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Plasmons in sodium under pressure : Increasing departure from nearly free-electron behavior. / Loa, I.; Syassen, K.; Monaco, G.; Vankó, G.; Krisch, M.; Hanfland, M.

In: Physical Review Letters, Vol. 107, No. 8, 086402, 16.08.2011.

Research output: Contribution to journalArticle

Loa, I. ; Syassen, K. ; Monaco, G. ; Vankó, G. ; Krisch, M. ; Hanfland, M. / Plasmons in sodium under pressure : Increasing departure from nearly free-electron behavior. In: Physical Review Letters. 2011 ; Vol. 107, No. 8.
@article{ba185f7456b24267beae0b0437b52412,
title = "Plasmons in sodium under pressure: Increasing departure from nearly free-electron behavior",
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.",
author = "I. Loa and K. Syassen and G. Monaco and G. Vank{\'o} and M. Krisch and M. Hanfland",
year = "2011",
month = "8",
day = "16",
doi = "10.1103/PhysRevLett.107.086402",
language = "English",
volume = "107",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "8",

}

TY - JOUR

T1 - Plasmons in sodium under pressure

T2 - Increasing departure from nearly free-electron behavior

AU - Loa, I.

AU - Syassen, K.

AU - Monaco, G.

AU - Vankó, G.

AU - Krisch, M.

AU - Hanfland, M.

PY - 2011/8/16

Y1 - 2011/8/16

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84860389870&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84860389870&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.107.086402

DO - 10.1103/PhysRevLett.107.086402

M3 - Article

AN - SCOPUS:84860389870

VL - 107

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 8

M1 - 086402

ER -