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26 April 2024 |
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Phonon dispersion and low energy anomaly in CaC$_6$ | | Matteo D'Astuto
; Matteo Calandra
; N. Bendiab
; G. Loupias
; Francesco Mauri
; Shuyun Zhou
; Jeff Graf
; Alessandra Lanzara
; N. Emery
; C. Herold
; P. Lagrange
; D. Petitgrand
; Moritz Hoesch
; | | Date: |
11 Nov 2009 | | Abstract: | We report measurements of phonon dispersions in CaC$_6$ using inelastic X-ray
and neutron scattering. We found good overall agreement, particularly in the 50
meV energy region, between the data and the first-principles
density-functional-theory calculations. However, on the longitudinal dispersion
along the c-axis of the hexagonal representation, we found 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. This result could help to explain the incorrect interpretation of
previous measurements of phonon dispersion in CaC$_6$, which assign a
longitudinal character 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 it
is probably due to defects or vacancies present in the sample. | | Source: | arXiv, 0911.2239 | | Services: | Forum | Review | PDF | Favorites | |
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