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

doi:10.1063/1.4959026

journal article·2016-07-01Open access

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

AIP Advances· Volume 6· Issue 7

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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.

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Research context

OpenAlex topics: 2D Materials and Applications · Topological Materials and Phenomena · Electronic and Structural Properties of Oxides

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

High Magnetic Field Laboratory 1 , Chinese Academy of Sciences, Hefei 230031, China

Institute of Solid State Physics 2 Key Laboratory of Materials Physics, , Chinese Academy of Sciences, Hefei 230031, China

Center for High Pressure Science and Technology Advanced Research 3 , Shanghai 201203, China

Nanjing University 4 National Laboratory of Solid State Microstructures, College of Physics, , Nanjing 210093, China

Nanjing University 5 Collaborative Innovation Center of Advanced Microstructures, , Nanjing 210093, China

Carnegie Institution of Washington 6 High Pressure Synergetic Consortium, Geophysical Laboratory, , Argonne, IL 60439, USA

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