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Title: Raman scattering investigation of large positive magnetoresistance material WTe{sub 2}

We have performed polarized Raman scattering measurements on WTe{sub 2}, for which an extremely large positive magnetoresistance has been reported recently. We observe 5 A{sub 1} phonon modes and 2 A{sub 2} phonon modes out of 33 Raman active modes, with frequencies in good accordance with first-principles calculations. The angular dependence of the intensity of the peaks observed is consistent with the Raman tensors of the C{sub 2v} point group symmetry attributed to WTe{sub 2}. Although the phonon spectra suggest neither strong electron-phonon nor spin-phonon coupling, the intensity of the A{sub 1} phonon mode at 160.6 cm{sup −1} shows an unconventional decrease with temperature decreasing, for which the origin remains unclear.
Authors:
; ; ; ; ;  [1] ; ;  [1] ;  [2]
  1. Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22412687
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COUPLING; ELECTRON-PHONON COUPLING; ELECTRONS; MAGNETORESISTANCE; PHONONS; RAMAN EFFECT; RAMAN SPECTROSCOPY; SPIN; SYMMETRY; TEMPERATURE DEPENDENCE; TENSORS; TUNGSTEN TELLURIDES