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- W1597530606 abstract "We report measurements of phonon dispersion in ${text{CaC}}_{6}$ 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 (111) axis of the rhombohedral representation, we find an unexpected anticrossing 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." @default.
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- W1597530606 date "2010-03-18" @default.
- W1597530606 modified "2023-10-10" @default.
- W1597530606 title "Phonon dispersion and low-energy anomaly in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>CaC</mml:mtext></mml:mrow><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>from inelastic neutron and x-ray scattering experiments" @default.
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- W1597530606 doi "https://doi.org/10.1103/physrevb.81.104519" @default.
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