PHONON DISPERSION RELATIONS FOR HOLMIUM

Using triple axis neutron spectrometry, the following branches of the phonon dispersion surfaces of paramagnetic holmium have been studied at 295°K: LA, LO, TA, and TO along [0001], LA, LO, TA⊥ and TO⊥ along [01 1 ̄0] and LA and TA⊥ along [1 12 ̄0]. Good agreement with interpolated elastic constants is obtained. © 1969.