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

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

doi:10.1063/1.4959026

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

Journal Article · Wed Jul 13 00:00:00 EDT 2016 · AIP Advances

DOI:https://doi.org/10.1063/1.4959026· OSTI ID:1267459

Zhou, Yonghui ^[1]; Chen, Xuliang ^[1]; Li, Nana ^[2]; Zhang, Ranran ^[1];

^[1];

^[1]; Pan, Xingchen ^[3]; Song, Fengqi ^[3]; Wang, Baigeng ^[3]; Yang, Wenge ^[4]; Yang, Zhaorong ^[5]; Zhang, Yuheng ^[5]

Chinese Academy of Sciences, Hefei (China)
Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
Nanjing Univ., Nanjing (China)
Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Carnegie Inst. of Washington, Argonne, IL (United States)
Chinese Academy of Sciences, Hefei (China); Nanjing Univ., Nanjing (China)

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.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: NA0001974; FG02-99ER45775; AC02-06CH11357; FG02-94ER14466

OSTI ID:: 1267459

Journal Information:: AIP Advances, Vol. 6, Issue 7; ISSN 2158-3226

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 9 works

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