The intertwining of magnetism with topology is known to give rise to exotic quantum phenomena. Here, we explore the magnetotransport properties of NdAlSi, a magnetic Weyl semimetal that spontaneously breaks inversion and time-reversal symmetries and hosts a large number of Weyl nodes. We observe a significant negative magnetoresistance, which we attribute to the chiral anomaly associated with multiple Weyl nodes. Remarkably, the extracted chiral coefficient reaches approximately 52mΩ−1m−1T−2, larger than many other topological materials. Additionally, we observe an exotic anomalous Hall effect with an out-of-sync behavior, where the anomalous Hall resistance does not exactly follow the field dependence of the magnetization, in contrast to that in conventional ferromagnets. These rich quantum transport phenomena, driven by the interplay between magnetism and Weyl nodes, establish NdAlSi as a prime platform for exploring the intricate topological behaviors of magnetic Weyl semimetals.
@article{arxiv.2502.03015,
title = {Significant Chiral Magnetotransport Magnified by Multiple Weyl Nodes},
author = {Bo Zhang and Junbo Liao and Zhentao Huang and Yanyan Shangguan and Shufan Cheng and Hao Xu and Zihang Song and Shuai Dong and Song Bao and Rui Wang and Jinsheng Wen},
journal= {arXiv preprint arXiv:2502.03015},
year = {2025}
}