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Comment on “Temperature dependence of atomic vibrations in mono-layer graphene” [J. Appl. Phys. 118
, 074302 (2015)]
5. Y.-L. Chen and D.-P. Yang, in Mössbauer Effect in Lattice Dynamics ( Wiley-VCH Verlag GmbH & Co., 2007), p. 177.
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In an interesting recent study [Allen et al., J. Appl. Phys. 118, 074302 (2015)] (see also their Erratum [Allen et al., J. Appl. Phys. 118, 159902 (2015)]), Allen and co-workers measured the mean square amplitudes of graphenelattice vibrations between 100 and 1300 K and used a simplified theoretical approximation for the acoustic phonon modes to evaluate the maximum phonon wavelengths supported by the lattice. By fitting their data using the smallest wave-vector as the fitting parameter, they found this to be significantly smaller than the physical size of the graphene crystallites.
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