Experimental measurement reveals phonon dispersion curves across nine symmetry lines in beryllium at 80K, highlighting the crucial role of three-body interatomic forces.
Phonon dispersion curves for nine symmetry lines in q space are presented and a table of frequencies for six symmetry points. Experimental details are described. The results are compared with previously published calculated dispersion curves based on two-body and three-body forces. The importance of three-body forces in Be is pointed out and interpreted in general terms, but no attempt has been made to fit the experimental data by a calculation incorporating this difficult feature.
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Stedman et al. (1976) studied this question.
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