Giant Topological Hall Effect in the Noncollinear Phase of Two-Dimensional Antiferromagnetic Topological Insulator MnBi4Te7

Roychowdhury S, Singh S, Guin SN, Kumar N, Chakraborty T, Schnelle W, Borrmann H, Shekhar C, Felser C (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Chemistry of Materials American Chemical Society

Book Volume: 33

Pages Range: 8343-8350

Journal Issue: 21

DOI: 10.1021/acs.chemmater.1c02625

Abstract

Magnetic topological insulators provide an important platform for realizing several exotic quantum phenomena, such as the axion insulating state and the quantum anomalous Hall effect, owing to the interplay between topology and magnetism. MnBi4Te7 is a two-dimensional Z2 antiferromagnetic (AFM) topological insulator with a Néel temperature of ∼13 K. In AFM materials, the topological Hall effect (THE) is observed owing to the existence of nontrivial spin structures. A material with noncollinearity that develops in the AFM phase rather than at the onset of the AFM order is particularly important. In this study, we observed that such an unanticipated THE starts to develop in a MnBi4Te7 single crystal when the magnetic field is rotated away from the easy axis (c-axis) of the system. Furthermore, the THE resistivity reaches a giant value of ∼7 μω-cm at 2 K when the angle between the magnetic field and the c-axis is 75°. This value is significantly higher than the values for previously reported systems with noncoplanar structures. The THE can be ascribed to the noncoplanar spin structure resulting from the canted state during the spin-flip transition in the ground AFM state of MnBi4Te7. The large THE at a relatively low applied field makes the MnBi4Te7 system a potential candidate for spintronic applications.

Involved external institutions

Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE)

How to cite

APA:

Roychowdhury, S., Singh, S., Guin, S.N., Kumar, N., Chakraborty, T., Schnelle, W.,... Felser, C. (2021). Giant Topological Hall Effect in the Noncollinear Phase of Two-Dimensional Antiferromagnetic Topological Insulator MnBi4Te7. Chemistry of Materials, 33(21), 8343-8350. https://doi.org/10.1021/acs.chemmater.1c02625

MLA:

Roychowdhury, Subhajit, et al. "Giant Topological Hall Effect in the Noncollinear Phase of Two-Dimensional Antiferromagnetic Topological Insulator MnBi4Te7." Chemistry of Materials 33.21 (2021): 8343-8350.

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