Abstract
Phonon spectra are calculated for fcc $^{36}\mathrm{Ar}$ at 4, 40, and 77 \ifmmode^\circ\else\textdegree\fi{}K using the pair potential for argon atoms derived by Bobetic and Barker. The calculation employs a quasiharmonic basis with three-body forces and a perturbation-theory treatment of the anharmonicity. Poor agreement is obtained with the experimental temperature shifts of transverse phonons propagating along the $[\ensuremath{\xi}00]$ direction. Self-consistent phonons are also calculated at 0 \ifmmode^\circ\else\textdegree\fi{}K for both the Bobetic-Barker and Dymond-Alder potentials. On the basis of existing phonon data, the latter appears to be ruled out as a realistic pair potential.
Published Version
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