Phonon dispersion and low energy anomaly in CaC$_6$

Details Phonon dispersion and low energy anomaly in CaC$_6$ Phonon dispersion and low energy anomaly in CaC$_6$

2009-11-11

arxiv.org/abs/0911.2239v4

Physics

Condensed Matter

Superconductivity

Accepted for publication in Physical Review B

Scientific paper

We report measurements of phonon dispersion in CaC$_6$ using inelastic X-ray and neutron scattering. We find good overall agreement, particularly in the 50 meV energy region, between experimental data and first-principles density-functional-theory calculations. However, on the longitudinal dispersion along the $(1 1 1)$ axis of the rhombohedral representation, we find an unexpected anti-crossing with an additional longitudinal mode, at about 11 meV. At a comparable energy, we observe also unexpected intensity on the in-plane direction. These results resolve the previous incorrect assignment of a longitudinal phonon mode to a transverse mode in the same energy range. By calculating the electron susceptibility from first principles we show that this longitudinal excitation is unlikely to be due to a plasmon and consequently can probably be due to defects or vacancies present in the sample.

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