Multi- k magnetic structure and large anomalous Hall effect in candidate magnetic Weyl semimetal NdAlGe
Multi- k magnetic structure and large anomalous Hall effect in candidate magnetic Weyl semimetal NdAlGe
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DOI：
10.1103/physrevb.107.224414
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发表时间：
2023-02
影响因子：
3.7
通讯作者：
C. Dhital;’† R.L.Dally2;R. Ruvalcaba;R. González-Hernández;J. Guerrero‐Sanchez;H. Cao;Q. Zhang;W. Tian;Y. Wu;M. Frontzek;S. Karna;A. Meads;B. Wilson;R. Chapai;D. Graf;J. Bacsa;R. Jin;J. Ditusa
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文献类型：
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作者：
C. Dhital;’† R.L.Dally2;R. Ruvalcaba;R. González-Hernández;J. Guerrero‐Sanchez;H. Cao;Q. Zhang;W. Tian;Y. Wu;M. Frontzek;S. Karna;A. Meads;B. Wilson;R. Chapai;D. Graf;J. Bacsa;R. Jin;J. Ditusa
研究了非中心对称磁性半金属NdAlGe的磁性结构、磁电阻和霍尔效应，揭示了与这种非中心对称化合物的电子结构相关的异常磁态和异常输运性质。磁化强度和磁阻测量结果均具有高度的各向异性，表明存在类似伊辛的磁系统。磁结构复杂，因为它涉及三个磁有序向量，包括不相称自旋密度波和零场相称铁磁态。我们发现了一个巨大的异常霍尔电导率，达到= 430 {\Omega}-1cm-1，这意味着它源于电子结构中发现的Weyl节点所产生的内在Berry曲率效应。这些电子结构计算表明存在嵌套的费米表面口袋，其嵌套波矢量与测量的磁有序波矢量相似，并且在费米表面附近存在Weyl节点。我们将不相称的磁性结构与巨大的反常霍尔响应联系起来，认为这是费米表面嵌套和与Weyl节点相关的Berry曲率相结合的结果。
The magnetic structure, magnetoresistance, and Hall effect of non-centrosymmetric magnetic semimetal NdAlGe are investigated revealing an unusual magnetic state and anomalous transport properties that are associated with the electronic structure of this non-centrosymmetric compound. The magnetization and magnetoresistance measurements are both highly anisotropic and indicate an Ising-like magnetic system. The magnetic structure is complex in that it involves three magnetic ordering vectors including an incommensurate spin density wave and commensurate ferrimagnetic state in zero field. We have discovered a large anomalous Hall conductivity that reaches = 430 {\Omega}-1cm-1 implying that it originates from an intrinsic Berry curvature effect stemming from Weyl nodes found in the electronic structure. These electronic structure calculations indicate the presence of nested Fermi surface pockets with nesting wave vectors similar to the measured magnetic ordering wavevector and the presence of Weyl nodes in proximity to the Fermi surface. We associate the incommensurate magnetic structure with the large anomalous Hall response to be the result of the combination of Fermi surface nesting and the Berry curvature associated with Weyl nodes.