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 and Sefaattin Tongay ()
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Kedi Wu: School for Engineering of Matter, Transport and Energy, Arizona State University
Engin Torun: University of Antwerp
Hasan Sahin: University of Antwerp
Bin Chen: School for Engineering of Matter, Transport and Energy, Arizona State University
Xi Fan: School for Engineering of Matter, Transport and Energy, Arizona State University
Anupum Pant: School for Engineering of Matter, Transport and Energy, Arizona State University
David Parsons Wright: LeRoy Eyring Center for Solid State Science, Arizona State University
Toshihiro Aoki: LeRoy Eyring Center for Solid State Science, Arizona State University
Francois M. Peeters: University of Antwerp
Emmanuel Soignard: LeRoy Eyring Center for Solid State Science, Arizona State University
Sefaattin Tongay: School for Engineering of Matter, Transport and Energy, Arizona State University

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms12952

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