We report the discovery of topological magnetism in the candidate magnetic Weyl semimetal CeAlGe. Using neutron scattering we find this system to host several incommensurate, square-coordinated multi-k magnetic phases below TN. The topological properties of a phase stable at intermediate magnetic fields parallel to the c-axis are suggested by observation of a topological Hall effect. Our findings highlight CeAlGe as an exceptional system for exploiting the interplay between the nontrivial topologies of the magnetization in real space and Weyl nodes in momentum space.
@article{arxiv.2001.06638,
title = {Topological Magnetic Phase in the Candidate Weyl Semimetal CeAlGe},
author = {P. Puphal and V. Pomjakushin and N. Kanazawa and V. Ukleev and D. J. Gawryluk and J. Ma and M. Naamneh and N. C. Plumb and L. Keller and R. Cubitt and E. Pomjakushina and J. S. White},
journal= {arXiv preprint arXiv:2001.06638},
year = {2020}
}