Raman scattering investigation of large positive magnetoresistance material WTe{sub 2}
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
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.
- OSTI ID:
- 22412687
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 8 Vol. 106; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
Similar Records
Anomalous vibrational modes in few layer WTe2 revealed by polarized Raman scattering and first-principles calculations
Anisotropic magnetotransport and exotic longitudinal linear magnetoresistance in WTe2 crystals