Electronic dynamics and plasmons of sodium under compression

QC 20120109
Sodium, which has long been regarded as one of the simplest metals, displays a great deal of structural, optical, and electronic complexities under compression. We compressed pure Na in the body-centered cubic structure to 52 GPa and in the face-centered cubic structure from 64 to 97 GPa, and studied the plasmon excitations of both structures using the momentum-dependent inelastic X-ray scattering technique. The plasmon dispersion curves as a function of pressure were extrapolated to zero momentum with a quadratic approximation. As predicted by the simple free-electron model, the square of the zero-momentum plasmon energy increases linearly with densification of the body-centered cubic Na up to 1.5-fold. At further compressions and in face-centered cubic Na above 64 GPa, the linear relation curves progressively toward the density axis up to 3.7-fold densification at 97 GPa. Ab initio calculations indicate that the deviation is an expected behavior of Na remaining a simple metal.

Ding, Yang (author)
Xiao, Yuming (author)
Chow, Paul (author)
Shu, Jinfu (author)
Lebegue, Sebastien (author)
Lazickif, Amy (author)
Ahuja, RajeevUppsala universitet,KTH,Tillämpad materialfysik,Materialteori(Swepub:uu)rajeeva (author)
KTHTillämpad materialfysik (creator_code:org_t)

In:Proceedings of the National Academy of Sciences of the United States of America: Proceedings of the National Academy of Sciences108:51, s. 20434-204370027-84241091-6490

By the author/editor: Mao, Ho-Kwang; Ding, Yang; Xiao, Yuming; Chow, Paul; Shu, Jinfu; Lebegue, Sebasti ...; show more...; Lazickif, Amy; Ahuja, Rajeev; show less...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Metallurgy and M ...

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