Competing Magnetic Interactions in the Antiferromagnetic Topological Insulator MnBi2Te4

Li, Bing; Yan, J.-Q.; Pajerowski, D.  M.; Gordon, Elijah; Nedić, A.-M.; Sizyuk, Y.; Ke, Liqin; Orth, P.  P.; Vaknin, D.; McQueeney, R.  J.

doi:10.1103/physrevlett.124.167204

Title: Competing Magnetic Interactions in the Antiferromagnetic Topological Insulator MnBi₂Te₄

Journal Article · 22 April 2020 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.124.167204 · OSTI ID:1649056

Li, Bing ^[1]; Yan, J.-Q. ^[2]; Pajerowski, D. M. ^[2]; Gordon, Elijah ^[3];

^[1]; Sizyuk, Y. ^[3]; Ke, Liqin ^[3];

^[1];

^[1]; McQueeney, R. J. ^[1]

Ames Lab., and Iowa State Univ., Ames, IA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Ames Lab., Ames, IA (United States)

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

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS); Ames Laboratory (AMES), Ames, IA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; AC02-07CH11358; AC02-05CH11231

OSTI ID:: 1649056

Alternate ID(s):: OSTI ID: 1615714

Journal Information:: Physical Review Letters, Vol. 124, Issue 16; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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