Dynamics in the charge-density-wave systemNbSe3using inelastic x-ray scattering with meV energy resolution

Abstract

We present a study of the ambient and low-temperature dynamics on a single-crystalline sample of ${\mathrm{NbSe}}_3$ using meV-resolution inelastic x-ray scattering. Two phonon branches (LA, ${\mathrm{TA}}_1)$ propagating along the system’s quasi-one-dimensional direction $b^{*}$ have been determined. The low-temperature data indicate the absence of a Kohn anomaly, similar to the case of $({\mathrm{TaSe}}_4{)}_2\mathrm{I},$ but at variance with other quasi-one-dimensional charge-density-wave systems (KCP, ${\mathrm{K}}_{0.3}{\mathrm{MoO}}_3)$ investigated so far.