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Multi-$$\mathcal{k}$$ magnetic structure and large anomalous Hall effect in candidate magnetic Weyl semimetal NdAlGe

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [4];  [3];  [5];  [5];  [5];  [5];  [5];  [6];  [1];  [1];  [7];  [8];  [9];  [10];  [11]
  1. Kennesaw State University, GA (United States)
  2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  3. Univ. Nacional Autonoma de Mexico (UNAM), Mexico City (Mexico)
  4. University of the North (Colombia)
  5. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  6. Prairie View A & M Univ., Prairie View, TX (United States); Louisiana State Univ., Baton Rouge, LA (United States)
  7. Louisiana State Univ., Baton Rouge, LA (United States)
  8. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  9. Emory Univ., Atlanta, GA (United States)
  10. Louisiana State Univ., Baton Rouge, LA (United States); Univ. of South Carolina, Columbia, SC (United States)
  11. Louisiana State Univ., Baton Rouge, LA (United States); Indiana Univ.-Purdue Univ. Indianapolis (IUPUI), Indianapolis, IN (United States)
Here, the magnetic structure, magnetoresistance (MR), and Hall effect of the noncentrosymmetric magnetic semimetal NdAlGe are investigated, revealing an unusual magnetic state and anomalous transport properties that are associated with the electronic structure of this compound. The magnetization and MR measurements are both highly anisotropic and indicate an Ising-like magnetic system. The magnetic structure is complex in that it involves two 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 like the measured magnetic ordering wave vector 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.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC05-00OR22725; SC0012432
OSTI ID:
1987761
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 22 Vol. 107; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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