Pressure-induced Td to 1T′ structural phase transition in WTe2
Creators
- 1. 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. Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093 (China)
- 6. High Pressure Synergetic Consortium, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, IL 60439 (United States)
Description
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.
Additional details
Identifiers
- DOI
- 10.1063/1.4959026;
Publishing Information
- Journal Title
- AIP Advances
- Journal Volume
- 6
- Journal Issue
- 7
- Journal Page Range
- p. 075008-075008.7
- ISSN
- 2158-3226
- CODEN
- AAIDBI
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 48057655
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Descriptors DEI
- COMPRESSION; LAYERS; MAGNETORESISTANCE; MONOCLINIC LATTICES; PHASE TRANSFORMATIONS; PRESSURE RANGE GIGA PA; SEMIMETALS; SPACE GROUPS; SUPERCONDUCTIVITY; SYNCHROTRON RADIATION; TUNGSTEN TELLURIDES; X-RAY DIFFRACTION
- Descriptors DEC
- BREMSSTRAHLUNG; CHALCOGENIDES; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DIFFRACTION; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ELECTROMAGNETIC RADIATION; ELEMENTS; PHYSICAL PROPERTIES; PRESSURE RANGE; RADIATIONS; REFRACTORY METAL COMPOUNDS; SCATTERING; SYMMETRY GROUPS; TELLURIDES; TELLURIUM COMPOUNDS; THREE-DIMENSIONAL LATTICES; TRANSITION ELEMENT COMPOUNDS; TUNGSTEN COMPOUNDS
Optional Information
- Notes
- (c) 2016 Author(s)