Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Submitted Manuscript

Publication Date

2019

Journal or Book Title

arXiv

Abstract

The antiferromagnetic (AF) compound MnBi2Te4 is suggested to be the first realization of an antiferromagnetic (AF) topological insulator. Here we report on inelastic neutron scattering studies of the magnetic interactions in MnBi2Te4 that possess ferromagnetic (FM) triangular layers with AF interlayer coupling. The spin waves display a large spin gap and pairwise exchange interactions within the triangular layer are frustrated due to large next-nearest neighbor AF exchange. The degree of frustration suggests proximity to a variety of magnetic phases, potentially including skyrmion phases, that could be accessed in chemically tuned compounds or upon the application of symmetry-breaking fields.

Comments

This is a pre-print of the article Yan, J-Q., D. Pajerowski, Liqin Ke, A. M. Nedić, Y. Sizyuk, Elijah Gordon, P. P. Orth, D. Vaknin, and R. J. McQueeney. "Competing magnetic interactions in the antiferromagnetic topological insulator MnBi2Te4." arXiv preprint arXiv:1908.02332 (2019). Posted with permission.

Copyright Owner

The Authors

Language

en

File Format

application/pdf

Published Version

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