Journal
APPLIED PHYSICS LETTERS
Volume 106, Issue 8, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4913680
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Funding
- MOST [2010CB923000, 2011CBA001000, 2011CBA00102, 2012CB821403, 2013CB921703]
- NSFC from China [11004232, 11034011/A0402, 11234014, 11274362, 11474330]
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We have performed polarized Raman scattering measurements on WTe2, for which an extremely large positive magnetoresistance has been reported recently. We observe 5 A(1) phonon modes and 2 A(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-2v point group symmetry attributed to WTe2. Although the phonon spectra suggest neither strong electron-phonon nor spin-phonon coupling, the intensity of the A(1) phonon mode at 160.6 cm(-1) shows an unconventional decrease with temperature decreasing, for which the origin remains unclear. (C) 2015 AIP Publishing LLC.
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