Unusual lattice vibration characteristics in whiskers of the pseudo-one-dimensional titanium trisulfide TiS3

Kedi Wu, Engin Torun, Hasan Sahin, Bin Chen, Xi Fan, Anupum Pant, David Parsons Wright, Toshihiro Aoki, Francois M. Peeters, Emmanuel Soignard, Sefaattin Tongay

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

Transition metal trichalcogenides form a class of layered materials with strong in-plane anisotropy. For example, titanium trisulfide (TiS3) whiskers are made out of weakly interacting TiS3 layers, where each layer is made of weakly interacting quasi-one-dimensional chains extending along the b axis. Here we establish the unusual vibrational properties of TiS3 both experimentally and theoretically. Unlike other two-dimensional systems, the Raman active peaks of TiS3 have only out-of-plane vibrational modes, and interestingly some of these vibrations involve unique rigid-chain vibrations and S-S molecular oscillations. High-pressure Raman studies further reveal that the AgS-S S-S molecular mode has an unconventional negative pressure dependence, whereas other peaks stiffen as anticipated. Various vibrational modes are doubly degenerate at ambient pressure, but the degeneracy is lifted at high pressures. These results establish the unusual vibrational properties of TiS3 with strong in-plane anisotropy, and may have relevance to understanding of vibrational properties in other anisotropic two-dimensional material systems.

Original languageEnglish (US)
Article number12952
JournalNature communications
Volume7
DOIs
StatePublished - Sep 22 2016

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Wu, K., Torun, E., Sahin, H., Chen, B., Fan, X., Pant, A., Wright, D. P., Aoki, T., Peeters, F. M., Soignard, E., & Tongay, S. (2016). Unusual lattice vibration characteristics in whiskers of the pseudo-one-dimensional titanium trisulfide TiS3. Nature communications, 7, [12952]. https://doi.org/10.1038/ncomms12952