Local trigonal modes and the suppression of the charge density wave in TiSe2-xTex

A. Wegner, D. Louca, J. Yang

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4 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number205110
JournalPhysical Review B
Volume99
Issue number20
DOIs
StatePublished - May 9 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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