Title

Competing magnetic interactions in the antiferromagnetic topological insulator MnBi2Te4

Publication Date

4-24-2020

Department

Ames Laboratory; Physics and Astronomy

Campus Units

Ames Laboratory, Physics and Astronomy

OSTI ID+

1615714

Report Number

IS-J 10211

DOI

10.1103/PhysRevLett.124.167204

Journal Title

Physical Review Letters

Volume Number

124

Issue Number

16

First Page

167204

Abstract

The antiferromagnetic (AFM) compound MnBi2Te4 is suggested to be the first realization of an AFM topological insulator. 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.

DOE Contract Number(s)

AC02-07CH11358; AC02-05CH11231

Language

en

Publisher

Iowa State University Digital Repository, Ames IA (United States)

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