We report the observation of in-plane anisotropic magnetoresistance (AMR) and planar Hall effect in our recently discovered kagome antiferromagnetic off-stoichiometric single crystal of Mn3Ga. We found that the in-plane AMR is dominated by a sixfold symmetry at low temperature due to the kagome lattice magnetocrystalline anisotropy. However, an unusual fourfold symmetry is also revealed by the angular-dependent AMR measurements, which originates from the little distortion of the crystal accompanying the slight ferromagnetic transition. Moreover, we also found a clear planar Hall effect signal in off-stoichiometric single crystal of Mn3Ga, which may be related to the chiral anomaly, one of the signatures of the magnetic Weyl fermions.

中文翻译：

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非化学计量单晶 Mn3Ga 中的面内各向异性磁阻和平面霍尔效应


我们报告了在我们最近发现的 kagome 反铁磁非化学计量 Mn3Ga单晶中观察到的面内各向异性磁阻 （AMR） 和平面霍尔效应。我们发现，由于 kagome 晶格磁晶各向异性，面内 AMR 在低温下以 6 重对称性为主。然而，与角度相关的 AMR 测量也揭示了不寻常的四重对称性，这源于伴随着轻微铁磁转变的晶体的轻微变形。此外，我们还在 Mn3Ga 的非化学计量单晶中发现了清晰的平面霍尔效应信号，这可能与磁外尔费米子的特征之一手性异常有关。