Charge density waves effects on the phonon modes of 1T-TaS2

The effects of lattice distortion driven charge density waves on the 1T polytype of TaS₂ are reported. The results of a raman study of this transition metal dichalcogenide show features consistent with results previously reported using resistivity and electron diffraction techniques. The possibility of the presence of a phason mode in the raman spectra is suggested and the temperature dependence of this mode is fitted to the expected functional form.