Abstract
The sequence of phase transitions and the symmetry of, in particular, the low temperature incommensurate and spin-Peierls phases of the quasi-one-dimensional inorganic spin-Peierls system $\mathrm{Ti}\mathrm{O}X$ ($X=\mathrm{Br}$ and Cl) have been studied using inelastic light scattering experiments. The anomalous first-order character of the transition to the spin-Peierls phase is found to be a consequence of the different symmetries of the incommensurate and spin-Peierls $(P{2}_{1}∕m)$ phases. The pressure dependence of the lowest transition temperature strongly suggests that magnetic interchain interactions play an important role in the formation of the spin-Peierls and the incommensurate phases. Finally, a comparison of Raman data on VOCl to the $\mathrm{Ti}\mathrm{O}X$ spectra shows that the high energy scattering previously observed has a phononic origin.
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