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; Fumitaka Kagawa

doi:10.1038/s41467-023-43962-0

Emergent zero-field anomalous Hall effect in a reconstructed rutile antiferromagnetic metal

Nat Commun. 2023 Dec 12;14(1):8240. doi: 10.1038/s41467-023-43962-0.

Authors

Meng Wang^#¹, Katsuhiro Tanaka^#², Shiro Sakai³, Ziqian Wang³, Ke Deng^{4

5}, Yingjie Lyu⁶, Cong Li⁶, Di Tian⁶, Shengchun Shen⁷, Naoki Ogawa^{3

8}, Naoya Kanazawa⁹, Pu Yu⁶, Ryotaro Arita^{3

2}, Fumitaka Kagawa^{10

11}

Affiliations

¹ RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan. meng.wang@riken.jp.
² Research Center for Advanced Science and Technology, University of Tokyo, Tokyo, 153-8904, Japan.
³ RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan.
⁴ Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China.
⁵ International Quantum Academy, Shenzhen, 518048, China.
⁶ State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, China.
⁷ Department of Physics, University of Science and Technology of China, Hefei, 230026, China.
⁸ Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo, 113-8656, Japan.
⁹ Institute of Industrial Science, The University of Tokyo, Tokyo, 153-8505, Japan.
¹⁰ RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan. fumitaka.kagawa@riken.jp.
¹¹ Department of Physics, Tokyo Institute of Technology, Tokyo, 152-8551, Japan. fumitaka.kagawa@riken.jp.

^# Contributed equally.

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, Ru_0.8Cr_0.2O₂. 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 Ru_0.8Cr_0.2O₂ 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.