Abstract
The phonon dispersion of the high-temperature bcc phase of Hf has been measured. The dispersion resembles very much those of the other group-IV metals: bcc Ti and bcc Zr. It is dominated by the low-energy L 2/3(1,1,1) mode and by the low-energy T{sub 1} ({xi}{xi}0) phonon branch with transverse (1{bar 1}0) polarization. These large-amplitude vibrations displace the lattice toward the stacking sequence of the high-pressure {omega} structure and the low-temperature hcp structure, respectively, and are interpreted as dynamical precursor fluctuations toward these low-symmetry phases within the high-symmetry bcc phase.
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