The composition dependence of the charge density wave (CDW) state is investigated in a solid solution of 1T-TiSe2-xTe2 using neutron scattering and a pair density function analysis. It is observed that the CDW order is quickly suppressed with doping, between 0.2≤x≤0.25. The suppression of the CDW is coupled with a change in the local symmetry from hexagonal to monoclinic. In the monoclinic, high-temperature phase, a Jahn-Teller (JT) distortion is observed between Ti and Se bonds that is suppressed with Te doping. These observations favor a CDW that is driven by a cooperative JT effect, as Ti-Se bond shortening is crucial to CDW formation and excess chalcogen to Ti charge transfer inhibits the JT mechanism.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics