Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inelastic X-ray Scattering Study of Phonons in Superconducting CaC6   We investigate the dispersion and temperature dependence of a number of
phonons in the recently discovered superconductor CaC6 utilizing inelastic
x-ray scattering. Four [00L] and two ab-plane phonon modes are observed, and
measured at temperatures both above and below T_c. In general, our measurements
of phonon dispersions are in good agreement with existing theoretical
calculations of the phonon dispersion. This is significant in light of several
discrepancies between experimental measurements of phonon-derived quantities
and theoretical calculations. The present work suggests that the origin of
these discrepancies lies in the understanding of the electron-phonon coupling
in this material, rather than in the phonons themselves.

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The categories of this paper are: atom-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th