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  • Title: Emergent zero-field anomalous Hall effect in a reconstructed rutile antiferromagnetic metal.
    Author: Wang M, Tanaka K, Sakai S, Wang Z, Deng K, Lyu Y, Li C, Tian D, Shen S, Ogawa N, Kanazawa N, Yu P, Arita R, Kagawa F.
    Journal: Nat Commun; 2023 Dec 12; 14(1):8240. PubMed ID: 38086819.
    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.
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