Tuning magnetism and band topology through antisite defects in Sb-doped MnBi 4 Te 7

Hu, Chaowei; Lien, Shang-Wei; Feng, Erxi; Mackey, Scott; Tien, Hung-Ju; Mazin, Igor I.; Cao, Huibo; Chang, Tay-Rong; Ni, Ni

doi:10.1103/physrevb.104.054422

Tuning magnetism and band topology through antisite defects in Sb-doped ${MnBi}_{4} {Te}_{7}$

Journal Article · Mon Aug 16 00:00:00 EDT 2021 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.104.054422· OSTI ID:1818654

Hu, Chaowei ^[1]; Lien, Shang-Wei ^[2]; Feng, Erxi ^[3]; ^[1]; Tien, Hung-Ju ^[2]; Mazin, Igor I. ^[4]; ^[3]; Chang, Tay-Rong ^[5]; ^[1]

Univ. of California, Los Angeles, CA (United States). California NanoSystems Institute
National Cheng Kung Univ., Tainan City (Taiwan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
George Mason Univ., Fairfax, VA (United States)
National Cheng Kung Univ., Tainan City (Taiwan); Center for Quantum Frontiers of Research and Technology (QFort), Tainan (Taiwan); National Taiwan Univ., Taipei (Taiwan)

The fine control of magnetism and electronic structure in a magnetic topological insulator is crucial in order to realize various novel magnetic topological states including axion insulators, magnetic Weyl semimetals, Chern insulators, etc. Through crystal growth, transport, thermodynamic, neutron diffraction measurements, we show that under Sb doping the newly discovered intrinsic antiferromagnetic (AFM) topological insulator MnBi₄Te₇ evolves from AFM to ferromagnetic (FM) and then ferrimagnetic. We attribute this to the formation of Mn(Bi,Sb) antisites upon doping, which results in additional Mn sublattices that modify the delicate interlayer magnetic interactions and cause the dominant Mn sublattice to go from AFM to FM. We further investigate the effect of antisites on the band topology using the first-principles calculations. Without considering antisites, the series evolves from AFM topological insulator (x=0) to FM axion insulators. In the exaggerated case of 16.7% of periodic antisites, the band topology is modified and a type-I magnetic Weyl semimetal phase can be realized at intermediate dopings. Therefore, this doping series provides a fruitful platform with continuously tunable magnetism and topology for investigating emergent phenomena, including quantum anomalous Hall effect, Fermi arc states, etc.

View Accepted Manuscript (DOE)

Research Organization:: George Mason Univ., Fairfax, VA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: Ministry of Science and Technology (MOST) in Taiwan; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; SC0021089; SC0021117

OSTI ID:: 1818654

Alternate ID(s):: OSTI ID: 1830625

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 5 Vol. 104; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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