Pressure-induced Td to 1T' structural phase transition in WTe2

Yonghui Zhou, Xuliang Chen, Nana Li, Ranran Zhang, Xuefei Wang, Chao An, Ying Zhou, Xingchen Pan, Fengqi Song, Baigeng Wang, Wenge Yang, Zhaorong Yang, Yuheng Zhang

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

WTe2 is provoking immense interest owing to its extraordinary properties, such as large positive magnetoresistance, pressure-driven superconductivity and possible type-II Weyl semimetal state. Here we report results of high-pressure synchrotron X-ray diffraction (XRD), Raman and electrical transport measurements on WTe2. Both the XRD and Raman results reveal a structural transition upon compression, starting at 6.0 GPa and completing above 15.5 GPa. We have determined that the high-pressure lattice symmetry is monoclinic 1T' with space group of P21/m. This transition is related to a lateral sliding of adjacent Te-W-Te layers and results in a collapse of the unit cell volume by ∼20.5%. The structural transition also casts a pressure range with the broadened superconducting transition, where the zero resistance disappears.

Original languageEnglish
Article number075008
JournalAIP Advances
Volume6
Issue number7
DOIs
Publication statusPublished - 2016 Jul 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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