Role of nonmagnetic spacers in the magnetic interactions of antiferromagnetic topological insulators MnBi4⁢Te7 and MnBi2⁢Te4

Li, Bing; Pajerowski, Daniel M.; Yan, Jiaqiang Q.; Mcqueeney, R J.

doi:10.1103/physrevb.111.064418

Title: Role of nonmagnetic spacers in the magnetic interactions of antiferromagnetic topological insulators MnBi₄⁢Te₇ and MnBi₂⁢Te₄

Journal Article · 13 February 2025 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.111.064418 · OSTI ID:2538103

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Ames Laboratory (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Ames Laboratory (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

MnBi₄⁢Te₇ belongs to a family of antiferromagnetic topological insulators. It forms a natural heterostructure of magnetic (septuple) and nonmagnetic (quintuple) topological blocks. Here, we explore the magnetism and magnetic interactions in this compound using inelastic neutron scattering. We find that the interlayer magnetic coupling is much weaker in MnBi₄⁢Te₇ as compared to MnBi_2⁢Te₄ due to the insertion of nonmagnetic quintuple layers in the former. However, other key magnetic energy scales residing within a single septuple block, the single-ion anisotropy and long-range intralayer exchanges, are essentially the same. In conclusion, this identifies a transferable set of magnetic interactions applicable to the extended family of magnetic topological insulators based on MnBi₂⁢Te₄–Bi₂⁢Te₃ heterostructures.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

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

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

OSTI ID:: 2538103

Report Number(s):: AL-J--733

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 6 Vol. 111; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Role of nonmagnetic spacers in the magnetic interactions of antiferromagnetic topological insulators MnBi₄⁢Te₇ and MnBi₂⁢Te₄