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)
