title: Evidence for an instability near twice the fermi wave vector in the low electronic density liquid metal Li(NH3)4.
abstract: We report high-resolution inelastic x-ray scattering measurements in the metallic 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 momentum transfers. This excitation shows a strong softening at wave vectors near the first peak in the structure factor, which occurs near twice the Fermi momentum.
authors: Department of Physics, Western Michigan University, Kalamazoo 49008, USA.
authors: C A
authors: CA
authors: Burns
authors: P M
authors: PM
authors: Platzman
authors: H
authors: H
authors: Sinn
authors: A
authors: A
authors: Alatas
authors: E E
authors: EE
authors: Alp