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1. C. S. Allen, E. Liberti, J. S. Kim, Q. Xu, Y. Fan et al., J. Appl. Phys. 118, 074302 (2015).
2. C. S. Allen, E. Liberti, J. S. Kim, Q. Xu, Y. Fan et al., J. Appl. Phys. 118, 159902 (2015).
3. V. K. Tewary and B. Yang, Phys. Rev. B 79(12), 125416 (2009).
4. V. K. Tewary and B. Yang, Phys. Rev. B 79(7), 075442 (2009).
5. Y.-L. Chen and D.-P. Yang, in Mössbauer Effect in Lattice Dynamics ( Wiley-VCH Verlag GmbH & Co., 2007), p. 177.
6. E. Pop, V. Varshney, and A. K. Roy, MRS Bull. 37(12), 1273 (2012).

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In an interesting recent study [Allen ., J. Appl. Phys. , 074302 (2015)] (see also their Erratum [Allen ., J. Appl. Phys. , 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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