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arXiv 1901.05040cond-mat.mtrl-sci
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非共线磁性反钙钛矿的反常霍尔电导

Anomalous Hall Conductivity of a Non-Collinear Magnetic Antiperovskite

Gautam Gurung, Ding-Fu Shao, Tula R. Paudel, Evgeny Y. Tsymbal

摘要:

反常霍尔效应(AHE)是铁磁金属的一个众所周知的基本性质,通常与净磁化的存在相关联。最近,在非共线反铁磁(AFM)金属中发现了AHE。原子力显微镜(AFM)材料具有一定的磁空间群对称性,在非零Berry曲率的驱动下,反常霍尔电导率(AHC)对特定类型的磁有序非常敏感。在这里,我们调查的外观AHC在反钙钛矿GaNMn $_{3}$作为更广泛的材料家族ANMn $_{3}$(A是主族元素)的代表,其中可以出现不同类型的非共线磁有序。利用对称性分析和第一性原理密度泛函理论计算,我们表明,几乎相同的能带结构,近简并的非共线AFM $Γ_{5g}$和$Γ_{4g}$相的GaNMn $_{3}$有零和有限的AHC,分别。在非共线亚铁磁$M$-1相中,GaNMn $_{3}$由于存在相当大的净磁矩而表现出大的AHC。在非共线反钙钛矿磁体中,不同磁相之间的转变,表现出不同的AHC状态,可以通过掺杂,应变或自旋转移矩产生,这使得这些材料有希望用于新的自旋电子学应用。

英文摘要:

The anomalous Hall effect (AHE) is a well-known fundamental property of ferromagnetic metals, commonly associated with the presence of a net magnetization. Recently, an AHE has been discovered in non-collinear antiferromagnetic (AFM) metals. Driven by non-vanishing Berry curvature of AFM materials with certain magnetic space group symmetry, anomalous Hall conductivity (AHC) is very sensitive to the specific type of magnetic ordering. Here, we investigate the appearance of AHC in antiperovskite GaNMn$_{3}$ as a representative of broader materials family ANMn$_{3}$ (A is a main group element), where different types of non-collinear magnetic ordering can emerge. Using symmetry analyses and first-principles density-functional theory calculations, we show that with almost identical band structure, the nearly degenerate non-collinear AFM $Γ_{5g}$ and $Γ_{4g}$ phases of GaNMn$_{3}$ have zero and finite AHC, respectively. In a non-collinear ferrimagnetic $M$-1 phase, GaNMn$_{3}$ exhibits a large AHC due to the presence of a sizable net magnetic moment. In the non-collinear antiperovskite magnets, transitions between different magnetic phases, exhibiting different AHC states, can be produced by doping, strain, or spin transfer torque, which makes these materials promising for novel spintronic applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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