The phonon dispersion of graphite by inelastic x-ray scattering

Details The phonon dispersion of graphite by inelastic x-ray scattering The phonon dispersion of graphite by inelastic x-ray scattering

2007-05-16

arxiv.org/abs/0705.2418v1

Physics

Condensed Matter

Materials Science

7 pages; submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.76.035439

We present the full in-plane phonon dispersion of graphite obtained from inelastic x-ray scattering, including the optical and acoustic branches, as well as the mid-frequency range between the $K$ and $M$ points in the Brillouin zone, where experimental data have been unavailable so far. The existence of a Kohn anomaly at the $K$ point is further supported. We fit a fifth-nearest neighbour force-constants model to the experimental data, making improved force-constants calculations of the phonon dispersion in both graphite and carbon nanotubes available.

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