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Multi-k Magnetic Structure and Large Anomalous Hall Effect in Candidate Magnetic Weyl Semimetal NdAlGe



C. Dhital, Rebecca Dally, R. Ruvalcaba, R. Gonzalez-Hernandez, J. Guerrero-Sanchez, Huibo Cao, Q. Zhang, W. Tian, Y. Wu, M. Frontzek, S. K. Karna, A. Meads, B. Wilson, R. Chapai, D. Graf, J. Bacsa, R. Jin, J. DiTusa


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-1 cm-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 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.
Physical Review B


neutron diffraction, anomalous Hall effect, Weyl semimetal, magnetic structure, non-centrosymmetric, DFT, magnetoresistance


Dhital, C. , Dally, R. , Ruvalcaba, R. , Gonzalez-Hernandez, R. , Guerrero-Sanchez, J. , Cao, H. , Zhang, Q. , Tian, W. , Wu, Y. , Frontzek, M. , Karna, S. , Meads, A. , Wilson, B. , Chapai, R. , Graf, D. , Bacsa, J. , Jin, R. and DiTusa, J. (2023), Multi-k Magnetic Structure and Large Anomalous Hall Effect in Candidate Magnetic Weyl Semimetal NdAlGe, Physical Review B, [online], (Accessed June 14, 2024)


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Created June 13, 2023, Updated January 23, 2024