Evidence for an instability near twice the Fermi wave vector in the low electronic density liquid metal Li(NH3)(4)

Authors
Burns, CA Platzman, PM Sinn, H Alatas, A Alp, EE
Citation
Ca. Burns et al., Evidence for an instability near twice the Fermi wave vector in the low electronic density liquid metal Li(NH3)(4), PHYS REV L, 86(11), 2001, pp. 2357-2360
Citations number
19
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
86
Issue
11
Year of publication
2001
Pages
2357 - 2360
Database
ISI
SICI code
0031-9007(20010312)86:11<2357:EFAINT>2.0.ZU;2-0
Abstract
We report high-resolution inelastic x-ray scattering measurements in the me tallic liquid Li(NH3)(4), which to a good approximation can be treated as a dilute alkali metal. We see a well-defined excitation out to large momentu m transfers. This excitation shows a strong softening at wave vectors near the first peak in the structure factor, which occurs near twice the Fermi m omentum.