Role of Magnetic Defects in Tuning Ground States of Magnetic Topological Insulators

Islam, Farhan; Lee, Yongbin; Pajerowski, Daniel M.; Oh, JinSu; Tian, Wei; Zhou, Lin; Yan, Jiaqiang; Ke, Liqin; McQueeney, Robert J.; Vaknin, David

doi:10.1002/adma.202209951

Title: Role of Magnetic Defects in Tuning Ground States of Magnetic Topological Insulators

Journal Article · 15 March 2023 · Advanced Materials

DOI: https://doi.org/10.1002/adma.202209951 · OSTI ID:1962139

^[1]; Lee, Yongbin ^[2];

^[3]; Oh, JinSu ^[2]; Tian, Wei ^[3];

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Division of Materials Sciences and Engineering Ames National Laboratory Ames IA 50011 USA, Department of Physics and Astronomy Iowa State University Ames IA 50011 USA
Division of Materials Sciences and Engineering Ames National Laboratory Ames IA 50011 USA
Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA
Division of Materials Sciences and Engineering Ames National Laboratory Ames IA 50011 USA, Department of Materials Science and Engineering Iowa State University Ames IA 50011 USA
Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA

Abstract Magnetic defects play an important, but poorly understood, role in magnetic topological insulators (TIs). For example, topological surface transport and bulk magnetic properties are controlled by magnetic defects in Bi ₂ Se ₃ ‐based dilute ferromagnetic (FM) TIs and MnBi ₂ Te ₄ (MBT)‐based antiferromagnetic (AFM) TIs. Despite its nascent ferromagnetism, the inelastic neutron scattering data show that a fraction of the Mn defects in Sb ₂ Te ₃ form strong AFM dimer singlets within a quintuple block. The AFM superexchange coupling occurs via Mn–Te–Mn linear bonds and is identical to the AFM coupling between antisite defects and the FM Mn layer in MBT, establishing common interactions in the two materials classes. It is also found that the FM correlations in (Sb _{1− x} Mn _x ) ₂ Te ₃ are likely driven by magnetic defects in adjacent quintuple blocks across the van der Waals gap. In addition to providing answers to long‐standing questions about the evolution of FM order in dilute TI, these results also show that the evolution of global magnetic order from AFM to FM in Sb‐substituted MBT is controlled by defect engineering of the intrablock and interblock coupling.

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

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

OSTI ID:: 1962139

Report Number(s):: IS-J-10,995; 2209951

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 21 Vol. 35; ISSN 0935-9648

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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36 MATERIALS SCIENCE
ferromagnetic correlation
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