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arXiv · 2307.05990

Emergent zero-field anomalous Hall effect in a reconstructedrutileantiferromagnetic metal

Meng Wang·Katsuhiro Tanaka·Shiro Sakai·Ziqian Wang·Ke Deng·Yingjie Lyu·Cong Li·Di Tian·Shengchun Shen·Naoki Ogawa·Naoya Kanazawa·Pu Yu·Ryotaro Arita·Fumitaka Kagawa
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Abstract

Anomalous Hall effect (AHE) emerged in antiferromagnetic metals shows intriguing physics and application potential. In contrast to certain noncollinear antiferromagnets, rutile RuO$_2$ has been proposed recently to exhibit a crystal-assisted AHE with collinear antiferromagnetism. However, in RuO$_2$, 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 RuO$_2$. 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 Ru$_{0.8}$Cr$_{0.2}$O$_2$ exhibits an orientation dependence consistent with the [110]-oriented N\'eel vector. These results open a new avenue to manipulate AHE in antiferromagnetic metals.

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Meng Wang, Katsuhiro Tanaka, Shiro Sakai, Ziqian Wang, Ke Deng, Yingjie Lyu, Cong Li, Di Tian, Shengchun Shen, Naoki Ogawa, Naoya Kanazawa, Pu Yu, Ryotaro Arita, Fumitaka Kagawa. 2023-07-12. Emergent zero-field anomalous Hall effect in a reconstructedrutileantiferromagnetic metal. https://arxiv.org/abs/2307.05990

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