Unsaturated magnetoresistance (MR) has been reported in WTe2, and remains irrepressible up to very high field. Intense optimization of the crystalline quality causes a squarely-increasing MR, as interpreted by perfect compensation of opposite carriers. Herein we report our observation of linear MR (LMR) in WTe2 crystals, the onset of which is first identified by constructing the mobility spectra of the MR at low fields. The LMR further intensifies and predominates at fields higher than 20 Tesla while the parabolic MR gradually decays. The LMR remains unsaturated up to a high field of 60 Tesla and persists, even at a high pressure of 6.2 GPa. Assisted by density functional theory calculations and detailed mobility spectra, we find the LMR to be robust against the applications of high field, broken carrier balance, and mobility suppression. Angle-resolved photoemission spectroscopy reveals a unique quasilinear energy dispersion near the Fermi level. Our results suggest that the robust LMR is the low bound of the unsaturated MR in WTe2.
@article{arxiv.1505.07968,
title = {Robust linear magnetoresistance in WTe2},
author = {Xing-Chen Pan and Yiming Pan and Juan Jiang and Huakun Zuo and Huimei Liu and Xuliang Chen and Zhongxia Wei and Shuai Zhang and Zhihe Wang and Xiangang Wan and Zhaorong Yang and Donglai Feng and Zhengcai Xia and Liang Li and Fengqi Song and Baigeng Wang and Yuheng Zhang and Guanghou Wang},
journal= {arXiv preprint arXiv:1505.07968},
year = {2016}
}