Emergent zero-field anomalous Hall effect in a reconstructed rutile antiferromagnetic 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 and Fumitaka Kagawa ()
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Meng Wang: RIKEN Center for Emergent Matter Science (CEMS)
Katsuhiro Tanaka: University of Tokyo
Shiro Sakai: RIKEN Center for Emergent Matter Science (CEMS)
Ziqian Wang: RIKEN Center for Emergent Matter Science (CEMS)
Ke Deng: Southern University of Science and Technology (SUSTech)
Yingjie Lyu: Tsinghua University
Cong Li: Tsinghua University
Di Tian: Tsinghua University
Shengchun Shen: University of Science and Technology of China
Naoki Ogawa: RIKEN Center for Emergent Matter Science (CEMS)
Naoya Kanazawa: The University of Tokyo
Pu Yu: Tsinghua University
Ryotaro Arita: RIKEN Center for Emergent Matter Science (CEMS)
Fumitaka Kagawa: RIKEN Center for Emergent Matter Science (CEMS)

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract The anomalous Hall effect (AHE) that emerges in antiferromagnetic metals shows intriguing physics and offers numerous potential applications. Magnets with a rutile crystal structure have recently received attention as a possible platform for a collinear-antiferromagnetism-induced AHE. RuO2 is a prototypical candidate material, however the AHE is prohibited at zero field by symmetry because of the high-symmetry [001] direction of the Néel vector at the ground state. Here, we show AHE at zero field in Cr-doped rutile, Ru0.8Cr0.2O2. The magnetization, transport and density functional theory calculations indicate that appropriate doping of Cr at Ru sites reconstructs the collinear antiferromagnetism in RuO2, resulting in a rotation of the Néel vector from [001] to [110] while maintaining a collinear antiferromagnetic state. The AHE with vanishing net moment in the Ru0.8Cr0.2O2 exhibits an orientation dependence consistent with the [110]-oriented Hall vector. These results demonstrate that material engineering by doping is a useful approach to manipulate AHE in antiferromagnetic metals.

Date: 2023
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DOI: 10.1038/s41467-023-43962-0

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