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  • Letter

Anisotropically large anomalous and topological Hall effect in a kagome magnet

Gyanendra Dhakal, Fairoja Cheenicode Kabeer, Arjun K. Pathak, Firoza Kabir, Narayan Poudel, Randall Filippone, Jacob Casey, Anup Pradhan Sakhya, Sabin Regmi, Christopher Sims, Klauss Dimitri, Pietro Manfrinetti, Krzysztof Gofryk, Peter M. Oppeneer, and Madhab Neupane
Phys. Rev. B 104, L161115 – Published 26 October 2021
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    Abstract

    Recently, kagome materials have become an engrossing platform to study the interplay among symmetry, magnetism, topology, and electron correlation. The latest works on RMn6Sn6 (R = rare-earth metal) compounds have illustrated that this family could be intriguing to investigate various physical phenomena due to large spin-orbit coupling and strong magnetic ordering. However, combined transport and spectroscopic studies in RMn6Sn6 materials are still limited. Here, we report magnetic, magnetotransport, and angle-resolved photoemission spectroscopy measurements of a kagome magnet ErMn6Sn6 that undergoes antiferromagnetic (TN=345K) to ferrimagnetic (TC=68K) phase transitions in the presence of a field. We observe large anomalous and topological Hall effects serving as transport signatures of the nontrivial Berry curvature. The isothermal magnetization exhibits strong anisotropic nature and the topological Hall effect of the compound depends on the critical field of metamagnetic transition. Our spectroscopic results complemented by theoretical calculations show the multiorbital kagome fermiology. This Letter provides new insight into the tunability and interplay of topology and magnetism in a kagome magnet.

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    • Received 16 April 2021
    • Accepted 8 October 2021

    DOI:https://doi.org/10.1103/PhysRevB.104.L161115

    ©2021 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Electronic structureFirst-principles calculationsMagnetic interactionsTopological materials
    Condensed Matter, Materials & Applied Physics

    Authors & Affiliations

    Gyanendra Dhakal1,*, Fairoja Cheenicode Kabeer2,*, Arjun K. Pathak3,*, Firoza Kabir1,*, Narayan Poudel4, Randall Filippone3, Jacob Casey3, Anup Pradhan Sakhya1, Sabin Regmi1, Christopher Sims1, Klauss Dimitri1, Pietro Manfrinetti5,6, Krzysztof Gofryk4, Peter M. Oppeneer2, and Madhab Neupane1,†

    • 1Department of Physics, University of Central Florida, Orlando, Florida 32816, USA
    • 2Department of Physics and Astronomy, Uppsala University, P. O. Box 516, S-75120 Uppsala, Sweden
    • 3Department of Physics, SUNY Buffalo State, Buffalo, New York 14222, USA
    • 4Idaho National Laboratory, Idaho Falls, Idaho 83402, USA
    • 5Department of Chemistry, University of Genova, 16146 Genova, Italy
    • 6Institute SPIN-CNR, 16152 Genova, Italy

    • *These authors contributed equally in this work.
    • †Corresponding author: Madhab.Neupane@ucf.edu

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    Issue

    Vol. 104, Iss. 16 — 15 October 2021

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    Images

    • Figure 1
      Figure 1

      Crystal structure and sample characterization of ErMn6Sn6. (a) Crystal structure of ErMn6Sn6. The right panel shows the top view of crystal structure forming the kagome lattice. (b) Bulk three-dimensional (3D) Brillouin zone (blue) along the projected [001] surface Brillouin zone (green) where high-symmetry points are labeled. (c) Electrical resistivity measured as a function of temperature in the zero field. The insets in the top left corner and the bottom right corner show the magnetic transitions. (d) First-principles calculations of the bulk band of ErMn6Sn6 with considering SOC.

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    • Figure 2
      Figure 2

      Magnetic properties of ErMn6Sn6 single crystals measured along both H∥ab and H∥c. (a) Magnetization as a function of temperature M(T), measured along H∥ab at H=0.1T. The inset in (a) shows M(T) measured along the H∥c at H=0.1T. (b) Magnetization as a function of magnetic field M(H) measured along both H∥ab and H∥c at T=2K. The M(H) was measured up to 9 T, only up to 3 T is shown for clarity. (c) and (d) Magnetization as a function of magnetic field measured along H∥ab and H∥c, respectively at different temperatures. The inset in (c) shows selected part of M(H) to show the metamagnetic transition around 1.4 T at T=200K. Hall resistivity of ErMn6Sn6 at different temperatures with (e) the H∥c and (f) H∥ab directions.

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    • Figure 3
      Figure 3

      Realization of anomalous and topological Hall effects. Hall resistivity and its three different components with (a) H∥ab plane, and (b) H∥c axis at a temperature of 200 K. The insets in (a) and (b) show ρT vs H in the vicinity of the critical fields along H∥ab and H∥c, respectively.

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    • Figure 4
      Figure 4

      Electronic structure of ErMn6Sn6. (a) Fermi-surface map at different temperatures. The temperature values are noted in the plots. (b) Calculated Fermi-surface map. (c) Dispersion maps along the M−Γ−M,K−Γ−K, and K−M−K directions, respectively, the FIM phase. ARPES measurements were performed at the SSRL beamline 5-2 using 100-eV photon energy with s polarization.

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