While pyrite-type PtBi2 with face-centered cubic structure has been predicted to be a three-dimensional (3D) Dirac semimetal, experimental study on its physical properties remains absent. Here we report the angular-dependent magnetoresistance (MR) measurements of PtBi2 single-crystal under high magnetic fields. We observed extreme large unsaturated magnetoresistance (XMR) up to 11.2 million percent at T = 1.8 K in a magnetic field of 33 T, which surpasses the previously reported Dirac materials, such as WTe2, LaSb and NbP. The crystals exhibit an ultrahigh mobility and significant Shubnikov-de Hass (SdH) quantum oscillations with nontrivial Berry's phase. Analysis of Hall resistivity indicates that the XMR can be ascribed to the nearly compensated electron and hole. Our experimental results associated with the ab initio calculations suggest that pyrite PtBi2 is a topological semimetal candidate which might provide a platform for exploring topological materials with XMR in noble metal alloys.
@article{arxiv.1609.02626,
title = {Extremely large magnetoresistance in a topological semimetal candidate pyrite PtBi2},
author = {Wenshuai Gao and Ningning Hao and Fa-Wei Zheng and Wei Ning and Min Wu and Xiangde Zhu and Guolin Zheng and Hongwei Zhang and Jinglei Zhang and Chuanying Xi and Jiyong Yang and Haifeng Du and Ping Zhang and Yuheng Zhang and Mingliang Tian},
journal= {arXiv preprint arXiv:1609.02626},
year = {2017}
}
Comments
18 pages, 6 figures,accepted by Physical Review Letters