Raman scattering investigation of large positive magnetoresistance material WTe${}_2$

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 $C_{2v}$ 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

References in corpus (5)

• Titanic Magnetoresistance in WTe2
• Electronic structure basis for the titanic magnetoresistance in WTe${}_2$
• Metal-Insulator-Like Behavior in Semimetallic Bismuth and Graphite
• Raman scattering investigation of the electron-phonon coupling in superconducting Nd(O,F)BiS${}_2$
• Raman scattering investigation of superconducting Ba${}_2$Ti${}_2$Fe${}_2$As${}_4$O

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