Effect of chemical substitution on the anomalous Hall effect of chiral-lattice antiferromagnet CoNb<sub>3</sub>S<sub>6</sub>

ORAL

Abstract

An ordinary Hall effect in a conductor arises due to the Lorentz force acting on the charge carriers. In ferromagnets, an additional contribution to the Hall effect, the anomalous Hall effect (AHE), appears proportional to the magnetization. It is also known that the AHE can arise in non-collinear and non-coplanar antiferromagnets due to scalar spin chirality. However, recently a large AHE was observed in a collinear antiferromagnet CoNb3S6 [1]. More recent theories have indicated that the AHE in CoNb3S6 may be inherently related to the chirality associated with the crystal structure [2,3]. The presence of a small ferromagnetic component plays an important role in revealing the AHE in CoNb3S6 which was limited to a narrow temperature range just below the Néel temperature. Here we will show that partial substitution of Co by Fe widens the temperature range and that the AHE in Co1-xFexNb3S6 saturates at lower temperatures. We will discuss the importance of this observation in the context of recent theories of the AHE in collinear antiferromagnets.

[1] Ghimire et al. Nat. Commun. 9, 3975 (2018).
[2] Šmejkal et al. arXiv:1901.00445 (2019).
[3] Zhang et al. arXiv:909.13338 (2019).

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Presenters

  • Dina Michel

    • Department of Physics and Astronomy, George Mason University

Authors

  • Dina Michel

    • Department of Physics and Astronomy, George Mason University

  • Nishchal Thapa Magar

    • Department of Physics and Astronomy, George Mason University

  • Nicholas Bishop

    • Department of Physics and Astronomy, George Mason University

  • Lekhanath Poudel

    • NIST Center for Neutron Research
    • NIST Center for Neutron Research, National Institute of Standards and Technology
    • Department of Materials Science and Engineering, University of Maryland, College Park

  • Jeffrey Lynn

    • NIST Center for Neutron Research, National Institute of Standards and Technology
    • NIST
    • Center for Neutron Research, National Institute of Standards and Technology
    • National Institute of Standards and Technology
    • NIST Center for Neutron Research

  • John Mitchell

    • Argonne National Laboratory
    • Materials Science Division, Argonne National Laboratory
    • Argonne Natl Lab
    • Materials Science Division, Argonne National Lab
    • Material Science Division, Argonne National Lab

  • Nirmal Ghimire

    • Department of Physics and Astronomy, George Mason University
    • George Mason University
    • Argonne Natl Lab