Abstract
The phonon-dispersion relations of the lightest wurtzite structure compound BeO have been determined from inelastic x-ray scattering (IXS) measurements and analyzed by ab initio calculations. Experimental data and calculations show good agreement and reconcile the existing controversies. The phonon linewidth of the longitudinal-optical phonon along $\ensuremath{\Gamma}\text{\ensuremath{-}}A$ reveals a marked $q$ dependence, which can be correlated with the two-phonon density of states, thus pointing toward a strong anharmonic behavior.
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