Abstract
Inelastic neutron scattering was carried out on the low-dimensional conductors (TaSe 4) 2I and Mo 8O 23. For (TaSe 4) 2I, a ‘spoon-like’ anomaly of the dispersion curve of the TA phonon branch was observed around the superlattice point. This result is in direct support of the TA mode condensation at the CDW transition, which was predicted based on X-ray studies and the Raman scattering study. Mo 8O 23 has a structural transition due to the incommensurate CDW formation at T c1⋍315K and a lock-in transition at T c2⋍285K. The present inelastic neutron scattering discloses the existence of a temperature dependent soft mode at the incommensurate superlattice point above T c1. A central peak is observed in the dynamical structure factor and grows as the temperature approaches T c1.
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