Evolution of magnetic interactions in Sb-substituted MnBi2Te4

Riberolles, Simon X. M.; Zhang, Qiang; Gordon, Elijah; Butch, Nicholas P.; Ke, Liqin; Yan, J. -Q.; McQueeney, Robert John

doi:10.1103/physrevb.104.064401

Title: Evolution of magnetic interactions in Sb-substituted MnBi₂Te₄

Abstract

The Mn(Bi_1–xSb_x)₂Te₄ series is purported to span from an antiferromagnetic (AF) topological insulator at x = 0 to a trivial AF insulator at x = 1. Here we report on neutron diffraction and inelastic neutron scattering studies of the magnetic interactions across this series. All compounds measured possess ferromagnetic (FM) triangular layers and we find a crossover from AF to FM interlayer coupling near x = 1 for our samples. The large spin gap at x = 0 closes rapidly and the average FM exchange interactions within the triangular layer increase with Sb substitution. Similar to a previous study of MnBi₂Te₄, we find severe spectral broadening which increases dramatically across the compositional series. In addition to broadening, we observe an additional sharp magnetic excitation in MnSb₂Te₄ that may indicate the development of local magnetic modes originating from antisite disorder between Mn and Sb sublattices. Here, the results suggest that both substitutional and antisite disorder contribute substantially to the magnetism in Mn(Bi_1–xSb_x)₂Te₄.

Authors:

^[1];

^[2]; Gordon, Elijah ^[1]; Butch, Nicholas P. ^[3];

^[1];

^[2]; McQueeney, Robert John ^[4]

Ames Lab., Ames, IA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

Publication Date:: Mon Aug 02 00:00:00 EDT 2021

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:: 1818951

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

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 104; Journal Issue: 6; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Magnetic interactions; Magnetic order; Magnons; Spin-orbit coupling; Topological materials; Neutron scattering

Citation Formats


                    Riberolles, Simon X. M., Zhang, Qiang, Gordon, Elijah, Butch, Nicholas P., Ke, Liqin, Yan, J. -Q., and McQueeney, Robert John. Evolution of magnetic interactions in Sb-substituted MnBi2Te4.  United States: N. p., 2021. 
Web.  doi:10.1103/physrevb.104.064401.

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                    Riberolles, Simon X. M., Zhang, Qiang, Gordon, Elijah, Butch, Nicholas P., Ke, Liqin, Yan, J. -Q., & McQueeney, Robert John. Evolution of magnetic interactions in Sb-substituted MnBi2Te4.  United States.  https://doi.org/10.1103/physrevb.104.064401

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                    Riberolles, Simon X. M., Zhang, Qiang, Gordon, Elijah, Butch, Nicholas P., Ke, Liqin, Yan, J. -Q., and McQueeney, Robert John. Mon .  
"Evolution of magnetic interactions in Sb-substituted MnBi2Te4".  United States.  https://doi.org/10.1103/physrevb.104.064401.  https://www.osti.gov/servlets/purl/1818951.

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@article{osti_1818951,

  title        = {Evolution of magnetic interactions in Sb-substituted MnBi2Te4},

  author       = {Riberolles, Simon X. M. and Zhang, Qiang and Gordon, Elijah and Butch, Nicholas P. and Ke, Liqin and Yan, J. -Q. and McQueeney, Robert John},

  abstractNote = {The Mn(Bi1–xSbx)2Te4 series is purported to span from an antiferromagnetic (AF) topological insulator at x = 0 to a trivial AF insulator at x = 1. Here we report on neutron diffraction and inelastic neutron scattering studies of the magnetic interactions across this series. All compounds measured possess ferromagnetic (FM) triangular layers and we find a crossover from AF to FM interlayer coupling near x = 1 for our samples. The large spin gap at x = 0 closes rapidly and the average FM exchange interactions within the triangular layer increase with Sb substitution. Similar to a previous study of MnBi2Te4, we find severe spectral broadening which increases dramatically across the compositional series. In addition to broadening, we observe an additional sharp magnetic excitation in MnSb2Te4 that may indicate the development of local magnetic modes originating from antisite disorder between Mn and Sb sublattices. Here, the results suggest that both substitutional and antisite disorder contribute substantially to the magnetism in Mn(Bi1–xSbx)2Te4.},

  doi          = {10.1103/physrevb.104.064401},

  journal      = {Physical Review B},

  number       = 6,

  volume       = 104,

  place        = {United States},

  year         = {Mon Aug 02 00:00:00 EDT 2021},

  month        = {Mon Aug 02 00:00:00 EDT 2021}

}

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Title: Evolution of magnetic interactions in Sb-substituted MnBi2Te4

Abstract

Citation Formats

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Title: Evolution of magnetic interactions in Sb-substituted MnBi₂Te₄

Generalized Gradient Approximation Made Simple
journal, October 1996

Coexistence of Surface Ferromagnetism and a Gapless Topological State in ${MnBi}_{2} {Te}_{4}$
journal, September 2020

Gapless Surface Dirac Cone in Antiferromagnetic Topological Insulator ${MnBi}_{2} {Te}_{4}$
journal, November 2019

Projector augmented-wave method
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Dirac Surface States in Intrinsic Magnetic Topological Insulators EuSn 2 As 2 and MnBi 2 n Te 3 n + 1
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Site Mixing for Engineering Magnetic Topological Insulators
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