Multi-k magnetic structure and large anomalous Hall effect in candidate magnetic Weyl semimetal NdAlGe

Abstract

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 Ω-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.

46 pages, 12 figures

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Cited by in corpus (11)

• Magnetic, thermodynamic, and magnetotransport properties of CeGaGe and PrGaGe single crystals
• Optical signatures of type-II Weyl fermions in the noncentrosymmetric semimetals $R$AlSi ($R$=La, Ce, Pr, Nd, Sm)
• Anomalous Hall effect with plateaus observed in a magnetic Weyl semimetal NdAlGe at low temperatures
• Spin order and dynamics in the topological rare-earth germanide semimetals
• Anisotropic metamagnetism and magnetotransport of heavy rare-earth orthorhombic single-crystal TbAlGe
• Structural characterization of the candidate Weyl semimetal CeGaGe
• Single crystalline orthorhombic GdAlGe as a rare earth magnetic Dirac nodal-line metal
• Incommensurate magnetic order drives singular angular magnetoresistance in a Weyl semimetal
• Isotropic Dirac fermion and anomalous oscillator strength of zeroth Landau level transition
• Accessing quasi-flat $\text{f}$-bands to harvest large Berry curvature in NdGaSi
• Anisotropic Magnetic and Transport Properties of RAlGe (R = Y, Gd-Tm, Lu)