Anomalous Hall effect (AHE) emerged in antiferromagnetic metals shows intriguing physics and application potential. In contrast to certain noncollinear antiferromagnets, rutile RuO2 has been proposed recently to exhibit a crystal-assisted AHE with collinear antiferromagnetism. However, in RuO2, the on-site magnetic moment accompanying itinerant 4d electrons is quite small, and more importantly, the AHE at zero external field is prohibited by symmetry because of the high-symmetry [001] direction of the N\'eel vector. Here, we show the AHE at zero field in the collinear antiferromagnet, Cr-doped RuO2. The appropriate doping of Cr at Ru sites results in a rotation of the N\'eel vector from [001] to [110] and enhancement of the on-site magnetic moment by one order of magnitude while maintaining a metallic state with the collinear antiferromagnetism. The AHE with vanishing net moment in the Ru0.8Cr0.2O2 exhibits an orientation dependence consistent with the [110]-oriented N\'eel vector. These results open a new avenue to manipulate AHE in antiferromagnetic metals.
@article{arxiv.2307.05990,
title = {Emergent zero-field anomalous Hall effect in a reconstructedrutileantiferromagnetic metal},
author = {Meng Wang and Katsuhiro Tanaka and Shiro Sakai and Ziqian Wang and Ke Deng and Yingjie Lyu and Cong Li and Di Tian and Shengchun Shen and Naoki Ogawa and Naoya Kanazawa and Pu Yu and Ryotaro Arita and Fumitaka Kagawa},
journal= {arXiv preprint arXiv:2307.05990},
year = {2023}
}