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

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.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [2] ;  [2] ;  [2] ;  [4] ;  [5] ;  [5] ;  [6] ;  [7] ;  [8]
  1. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China; Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
  2. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China
  3. Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
  4. National Laboratory of Solid State Microstructures, College of Physics, Nanjing University, Nanjing 210093, China
  5. National Laboratory of Solid State Microstructures, College of Physics, Nanjing University, Nanjing 210093, China; Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  6. Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China; High Pressure Synergetic Consortium, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, IL 60439, USA
  7. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China; Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China; Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  8. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China; Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
Publication Date:
OSTI Identifier:
1267459
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 6; Journal Issue: 7
Publisher:
American Institute of Physics (AIP)
Research Org:
Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
ENGLISH
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY