Abstract
A model for the frequency-distribution function of phonons in graphite that explicitly takes into account the presence of two-dimensional modes has been used to explain successfully (i) the recently observed temperature-dependent displacement-displacement autocorrelation function perpendicular to the basal plane (uz2) in the temperature range 5-300 K, (ii) the measured specific heat in the temperature range 10-300 K and (iii) the observed second-order Doppler shift in the temperature range 293-743 K. It is found that the two dimensional modes play a dominant role over the entire temperature range. Calculations based on other anisotropic models for (uz2) have also been made and compared.
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