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Title: A-type antiferromagnetic order in MnBi4Te7 and MnBi6Te10 single crystals

Abstract

MnBi 4 Te 7 and MnBi 6 Te 10 are two members with n = 2 and 3 in the family of MnBi 2 n Te 3 n + 1 where the n = 1 member, MnBi 2 Te 4 , has been intensively investigated as the first intrinsic antiferromagnetic topological insulator. In this work, we report the A-type antiferromagnetic order in these two compounds by measuring magnetic properties, electrical and thermal transport, specific heat, and single-crystal neutron diffraction. Both compounds order into an A-type antiferromagnetic structure as does MnBi 2 Te 4 with ferromagnetic planes coupled antiferromagnetically along the crystallographic c axis. While no evidence for any in-plane ordered moment is found for MnBi 2 Te 4 or MnBi 6 Te 10 , weak reflections at half- L positions along the [0 0 L ] direction are observed for MnBi 4 Te 7 suggesting an in-plane ordered moment around 0.15 μ B / Mn . The ordering temperature, T N , is 13 K for MnBi 4 Te 7 and 11 K for MnBi 6 Te 10 . The magnetic order is also manifested in the anisotropic magnetic properties. Furthermore, for both compounds, the interlayer coupling is weak and a spin-flip transition occurs when a magnetic field of around 1.6 kOe is applied along the c axis at 2 K. As observed in MnBi 2 Te 4 , when cooling across T N , no anomaly was observed in the temperature dependence of thermopower. On the other hand, critical scattering effects are observed in thermal conductivity although the effect is less pronounced than that in MnBi 2 Te 4 .

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1649473
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 4; Journal Issue: 5; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Antiferromagnetism; lattice thermal conductivity; magnetic susceptibility; single crystal materials; topological insulators; crystal growth; DC susceptibility measurements; density functional theory; neutron diffraction

Citation Formats

Yan, J. -Q., Liu, Y. H., Parker, D. S., Wu, Y., Aczel, A. A., Matsuda, M., McGuire, M. A., and Sales, B. C.. A-type antiferromagnetic order in MnBi4Te7 and MnBi6Te10 single crystals. United States: N. p., 2020. Web. https://doi.org/10.1103/physrevmaterials.4.054202.
Yan, J. -Q., Liu, Y. H., Parker, D. S., Wu, Y., Aczel, A. A., Matsuda, M., McGuire, M. A., & Sales, B. C.. A-type antiferromagnetic order in MnBi4Te7 and MnBi6Te10 single crystals. United States. https://doi.org/10.1103/physrevmaterials.4.054202
Yan, J. -Q., Liu, Y. H., Parker, D. S., Wu, Y., Aczel, A. A., Matsuda, M., McGuire, M. A., and Sales, B. C.. Thu . "A-type antiferromagnetic order in MnBi4Te7 and MnBi6Te10 single crystals". United States. https://doi.org/10.1103/physrevmaterials.4.054202. https://www.osti.gov/servlets/purl/1649473.
@article{osti_1649473,
title = {A-type antiferromagnetic order in MnBi4Te7 and MnBi6Te10 single crystals},
author = {Yan, J. -Q. and Liu, Y. H. and Parker, D. S. and Wu, Y. and Aczel, A. A. and Matsuda, M. and McGuire, M. A. and Sales, B. C.},
abstractNote = {MnBi4Te7 and MnBi6Te10 are two members with n=2 and 3 in the family of MnBi2nTe3n+1 where the n=1 member, MnBi2Te4, has been intensively investigated as the first intrinsic antiferromagnetic topological insulator. In this work, we report the A-type antiferromagnetic order in these two compounds by measuring magnetic properties, electrical and thermal transport, specific heat, and single-crystal neutron diffraction. Both compounds order into an A-type antiferromagnetic structure as does MnBi2Te4 with ferromagnetic planes coupled antiferromagnetically along the crystallographic c axis. While no evidence for any in-plane ordered moment is found for MnBi2Te4 or MnBi6Te10, weak reflections at half-L positions along the [0 0 L] direction are observed for MnBi4Te7 suggesting an in-plane ordered moment around 0.15μB/Mn. The ordering temperature, TN, is 13 K for MnBi4Te7 and 11 K for MnBi6Te10. The magnetic order is also manifested in the anisotropic magnetic properties. Furthermore, for both compounds, the interlayer coupling is weak and a spin-flip transition occurs when a magnetic field of around 1.6 kOe is applied along the c axis at 2 K. As observed in MnBi2Te4, when cooling across TN, no anomaly was observed in the temperature dependence of thermopower. On the other hand, critical scattering effects are observed in thermal conductivity although the effect is less pronounced than that in MnBi2Te4.},
doi = {10.1103/physrevmaterials.4.054202},
journal = {Physical Review Materials},
number = 5,
volume = 4,
place = {United States},
year = {2020},
month = {5}
}

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