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

Published

June 13, 2023

Author(s)

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

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-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.

Citation

Physical Review B

Volume

107

Issue

22

Pub Type

Journals

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DOI Link

Keywords

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

Citation

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], https://dx.doi.org/10.1103/PhysRevB.107.224414 (Accessed May 5, 2024)