Using inelastic neutron scattering the authors have determined seven out of the nine dispersion branches of each of the Delta 1, Delta 2 and Delta 3 representations for wavevectors along the threefold screw axis as well as the 13 branches of the T1 symmetry along the twofold axis. Strong dispersion occurs even in some of the highest-frequency branches.
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Strauch et al. (1993) studied this question.
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