Neutron diffraction study of magnetism in van der Waals layered MnBi2nTe3n+1
Abstract
Two-dimensional van der Waals MnBi2nTe3n+1 (n = 1, 2, 3, 4) compounds have been recently found to be intrinsic magnetic topological insulators rendering quantum anomalous Hall effect and diverse topological states. Here, we summarize and compare the crystal and magnetic structures of this family, and discuss the effects of chemical composition on their magnetism. We found that a considerable fraction of Bi occupies at the Mn sites in MnBi2nTe3n+1 (n = 1, 2, 3, 4) while there is no detectable Mn at the non-magnetic atomic sites within the resolution of neutron diffraction experiments. The occupancy of Mn monotonically decreases with the increase of n. The polarized neutron diffraction on the representative MnBi4Te7 reveals that its magnetization density is exclusively accumulated at the Mn site, in good agreement with the results from the unpolarized neutron diffraction. The defects of Bi at the Mn site naturally explain the continuously reduced saturated magnetic moments from n = 1 to n = 4. The experimentally estimated critical exponents of all the compounds generally suggest a three-dimensional character of magnetism. Our work provides material-specified structural parameters that may be useful for band structure calculations to understand the observed topological surface states and for designing quantummore »
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
- Univ. of California, Los Angeles, CA (United States)
- Centre National de la Recherche Scientifique (CNRS), Gif-sur-Yvette (France)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1767852
- Grant/Contract Number:
- AC05-00OR22725; SC0011978
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physics. D, Applied Physics
- Additional Journal Information:
- Journal Volume: 54; Journal Issue: 17; Journal ID: ISSN 0022-3727
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Ding, Lei, Hu, Chaowei, Feng, Erxi, Jiang, Chenyang, Kibalin, Iurii A., Gukasov, Arsen, Chi, MiaoFang, Ni, Ni, and Cao, Huibo. Neutron diffraction study of magnetism in van der Waals layered MnBi2nTe3n+1. United States: N. p., 2021.
Web. doi:10.1088/1361-6463/abe0dd.
Ding, Lei, Hu, Chaowei, Feng, Erxi, Jiang, Chenyang, Kibalin, Iurii A., Gukasov, Arsen, Chi, MiaoFang, Ni, Ni, & Cao, Huibo. Neutron diffraction study of magnetism in van der Waals layered MnBi2nTe3n+1. United States. https://doi.org/10.1088/1361-6463/abe0dd
Ding, Lei, Hu, Chaowei, Feng, Erxi, Jiang, Chenyang, Kibalin, Iurii A., Gukasov, Arsen, Chi, MiaoFang, Ni, Ni, and Cao, Huibo. Tue .
"Neutron diffraction study of magnetism in van der Waals layered MnBi2nTe3n+1". United States. https://doi.org/10.1088/1361-6463/abe0dd. https://www.osti.gov/servlets/purl/1767852.
@article{osti_1767852,
title = {Neutron diffraction study of magnetism in van der Waals layered MnBi2nTe3n+1},
author = {Ding, Lei and Hu, Chaowei and Feng, Erxi and Jiang, Chenyang and Kibalin, Iurii A. and Gukasov, Arsen and Chi, MiaoFang and Ni, Ni and Cao, Huibo},
abstractNote = {Two-dimensional van der Waals MnBi2nTe3n+1 (n = 1, 2, 3, 4) compounds have been recently found to be intrinsic magnetic topological insulators rendering quantum anomalous Hall effect and diverse topological states. Here, we summarize and compare the crystal and magnetic structures of this family, and discuss the effects of chemical composition on their magnetism. We found that a considerable fraction of Bi occupies at the Mn sites in MnBi2nTe3n+1 (n = 1, 2, 3, 4) while there is no detectable Mn at the non-magnetic atomic sites within the resolution of neutron diffraction experiments. The occupancy of Mn monotonically decreases with the increase of n. The polarized neutron diffraction on the representative MnBi4Te7 reveals that its magnetization density is exclusively accumulated at the Mn site, in good agreement with the results from the unpolarized neutron diffraction. The defects of Bi at the Mn site naturally explain the continuously reduced saturated magnetic moments from n = 1 to n = 4. The experimentally estimated critical exponents of all the compounds generally suggest a three-dimensional character of magnetism. Our work provides material-specified structural parameters that may be useful for band structure calculations to understand the observed topological surface states and for designing quantum magnetic materials through chemical doping.},
doi = {10.1088/1361-6463/abe0dd},
journal = {Journal of Physics. D, Applied Physics},
number = 17,
volume = 54,
place = {United States},
year = {Tue Feb 16 00:00:00 EST 2021},
month = {Tue Feb 16 00:00:00 EST 2021}
}
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