Abstract
We have measured the longitudinal [001] and the out-of-plane transverse [100] phonon modes of Li${\mathrm{C}}_{6}$ by inelastic neutron scattering, including the observation of very-high-energy phonon groups, tentatively assigned to optic modes. The phonon branches yield interlayer force constants and elastic moduli ${C}_{33}$ and ${C}_{44}$ which are considerably larger than those of the heavy alkali-metal stage-1 compounds. Yet, Li${\mathrm{C}}_{6}$ still shows an $\ensuremath{\omega}\ensuremath{\sim}{q}^{2}$ dispersion of the transverse basal-plane mode, characteristic for layered materials.
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