paper

Raman scattering investigation of large positive magnetoresistance material WTe $_{2}$

arXiv:1501.06321 · doi:10.1063/1.4913680

Abstract

We have performed polarized Raman scattering measurements on WTe $_{2}$ , 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 $C_{2 v}$ point group symmetry attributed to WTe $_{2}$ . 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.

4 pages, 3 figures, 2 tables. Resistivity scale in Fig. 1 normalized

Raman scattering investigation of large positive magnetoresistance material WTe2​

Abstract

Raman scattering investigation of large positive magnetoresistance material WTe $_{2}$