Dirac nodal-line semimetals with the linear bands crossing along a line or loop, represent a new topological state of matter. Here, by carrying out magnetotransport measurements and performing first-principle calculations, we demonstrate that such a state has been realized in high-quality single crystals of SrAs3. We obtain the nontrivial pi Berry phase by analysing the Shubnikov-de Haas quantum oscillations. We also observe a robust negative longitudinal magnetoresistance induced by the chiral anomaly. Accompanying first-principles calculations identify that a single hole pocket enclosing the loop nodes is responsible for these observations.
@article{arxiv.1805.06110,
title = {Evidence for a Dirac nodal-line semimetal in SrAs$_{3}$},
author = {Shichao Li and Zhaopeng Guo and Dongzhi Fu and Xing-Chen Pan and Jinghui Wang and Kejing Ran and Song Bao and Zhen Ma and Zhengwei Cai and Rui Wang and Rui Yu and Jian Sun and Fengqi Song and Jinsheng Wen},
journal= {arXiv preprint arXiv:1805.06110},
year = {2018}
}