通过固定非共面Mn反铁磁序下非磁性N占据的切换反常霍尔和能斯特响应
Switching Anomalous Hall and Nernst Responses by Nonmagnetic N Occupation at Fixed Noncoplanar Mn Antiferromagnetic Order
- Hebei Normal University（河北师范大学）
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AI总结：
本研究通过固定Mn反铁磁序、仅改变N亚晶格占据，展示了非磁性原子占据作为对称性控制参数，可调控反常霍尔和能斯特响应，实现零-有限-零演变，并在Mn4N中实现-126 S/cm的反常霍尔电导率。
AI中文摘要：
非磁性原子占据可以通过修改磁对称性而不改变底层磁序来控制反常横向输运。我们使用具有相同晶格常数和相同非共面全进全出Mn磁构型的受控γ-Mn、Mn4N和MnN参考态来演示这一效应，仅改变N亚晶格的占据。尽管Mn自旋序不变，反常霍尔和反常能斯特响应在整个系列中表现出明显的零-有限-零演变。在γ-Mn和MnN中，高磁对称性强制布里渊区积分贝里曲率完全抵消。在Mn4N中，N占据降低了磁对称性，同时保持反演对称性并打破相关的二重旋转对称性，从而解除抵消约束并允许沿[111]方向存在未补偿的贝里曲率贡献。由此产生的有限反常霍尔电导率在费米能级附近达到-126 S/cm。这些结果确立了非磁性亚晶格占据作为补偿反铁磁体中贝里曲率驱动输运的对称性控制参数，且独立于磁序的变化。
英文摘要：
Nonmagnetic atomic occupation can control anomalous transverse transport by modifying magnetic symmetry without changing the underlying magnetic order. We demonstrate this effect using controlled $γ$-Mn, Mn$_4$N, and MnN reference states with the same lattice constant and identical noncoplanar all-in-all-out Mn magnetic configurations, while varying only the occupation of the N sublattice. The anomalous Hall and anomalous Nernst responses exhibit a pronounced zero--finite--zero evolution across the series despite the unchanged Mn spin order. In $γ$-Mn and MnN, the high magnetic symmetry enforces complete cancellation of the Brillouin-zone-integrated Berry curvature. In Mn$_4$N, N occupation lowers the magnetic symmetry while preserving inversion and breaking the relevant twofold rotational symmetries, thereby lifting the cancellation constraint and permitting an uncompensated Berry-curvature contribution along the [111] direction. The resulting finite anomalous Hall conductivity reaches $-126$~S/cm near the Fermi level. These results establish nonmagnetic sublattice occupation as a symmetry-control parameter for Berry-curvature-driven transport in compensated antiferromagnets, independent of changes in the magnetic order.
