Competing Magnetic Interactions in the Antiferromagnetic Topological Insulator MnBi2Te4

Li, Bing; Yan, J.-Q.; Pajerowski, D.  M.; Gordon, Elijah; Nedić, A.-M.; Sizyuk, Y.; Ke, Liqin; Orth, P.  P.; Vaknin, D.; McQueeney, R.  J.

doi:10.1103/physrevlett.124.167204

Title: Competing Magnetic Interactions in the Antiferromagnetic Topological Insulator MnBi₂Te₄

Abstract

The antiferromagnetic (AFM) compound MnBi₂Te₄ is suggested to be the first realization of an AFM topological insulator. Here, we report on inelastic neutron scattering studies of the magnetic interactions in MnBi₂Te₄ that possess ferromagnetic triangular layers with AFM interlayer coupling. The spin waves display a large spin gap and pairwise exchange interactions within the triangular layer are long ranged and frustrated by large next-nearest neighbor AFM exchange. The degree of frustration suggests proximity to a variety of magnetic phases, potentially including skyrmion phases, which could be accessed in chemically tuned compounds or upon the application of symmetry-breaking fields.

Authors:

Li, Bing ^[1]; Yan, J.-Q. ^[2]; Pajerowski, D. M. ^[2]; Gordon, Elijah ^[3];

^[1]; Sizyuk, Y. ^[3]; Ke, Liqin ^[3];

^[1];

^[1]; McQueeney, R. J. ^[1]

Ames Lab., and Iowa State Univ., Ames, IA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Ames Lab., Ames, IA (United States)

Publication Date:: Wed Apr 22 00:00:00 EDT 2020

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS); Ames Lab., Ames, IA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

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

OSTI Identifier:: 1649056

Alternate Identifier(s):: OSTI ID: 1615714

Grant/Contract Number:: AC05-00OR22725; AC02-07CH11358; AC02-05CH11231

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Volume: 124; Journal Issue: 16; Journal ID: ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Frustrated magnetism; Physical Systems; Topological insulators

Citation Formats


                    Li, Bing, Yan, J.-Q., Pajerowski, D.  M., Gordon, Elijah, Nedić, A.-M., Sizyuk, Y., Ke, Liqin, Orth, P.  P., Vaknin, D., and McQueeney, R.  J. Competing Magnetic Interactions in the Antiferromagnetic Topological Insulator MnBi2Te4.  United States: N. p., 2020. 
Web.  doi:10.1103/physrevlett.124.167204.

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                    Li, Bing, Yan, J.-Q., Pajerowski, D.  M., Gordon, Elijah, Nedić, A.-M., Sizyuk, Y., Ke, Liqin, Orth, P.  P., Vaknin, D., & McQueeney, R.  J. Competing Magnetic Interactions in the Antiferromagnetic Topological Insulator MnBi2Te4.  United States.  https://doi.org/10.1103/physrevlett.124.167204

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                    Li, Bing, Yan, J.-Q., Pajerowski, D.  M., Gordon, Elijah, Nedić, A.-M., Sizyuk, Y., Ke, Liqin, Orth, P.  P., Vaknin, D., and McQueeney, R.  J. Wed .  
"Competing Magnetic Interactions in the Antiferromagnetic Topological Insulator MnBi2Te4".  United States.  https://doi.org/10.1103/physrevlett.124.167204.  https://www.osti.gov/servlets/purl/1649056.

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@article{osti_1649056,

  title        = {Competing Magnetic Interactions in the Antiferromagnetic Topological Insulator MnBi2Te4},

  author       = {Li, Bing and Yan, J.-Q. and Pajerowski, D.  M. and Gordon, Elijah and Nedić, A.-M. and Sizyuk, Y. and Ke, Liqin and Orth, P.  P. and Vaknin, D. and McQueeney, R.  J.},

  abstractNote = {The antiferromagnetic (AFM) compound MnBi2Te4 is suggested to be the first realization of an AFM topological insulator. Here, we report on inelastic neutron scattering studies of the magnetic interactions in MnBi2Te4 that possess ferromagnetic triangular layers with AFM interlayer coupling. The spin waves display a large spin gap and pairwise exchange interactions within the triangular layer are long ranged and frustrated by large next-nearest neighbor AFM exchange. The degree of frustration suggests proximity to a variety of magnetic phases, potentially including skyrmion phases, which could be accessed in chemically tuned compounds or upon the application of symmetry-breaking fields.},

  doi          = {10.1103/physrevlett.124.167204},

  journal      = {Physical Review Letters},

  number       = 16,

  volume       = 124,

  place        = {United States},

  year         = {Wed Apr 22 00:00:00 EDT 2020},

  month        = {Wed Apr 22 00:00:00 EDT 2020}

}

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Title: Competing Magnetic Interactions in the Antiferromagnetic Topological Insulator MnBi2Te4

Abstract

Citation Formats

Generalized Gradient Approximation Made Simple journal, October 1996

Spin-wave measurements on hexagonal MnTe of NiAs -type structure by inelastic neutron scattering journal, March 2006

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Two-dimensional ordering and collective magnetic excitations in the dilute ferromagnetic topological insulator ( Bi 0.95 Mn 0.05 ) 2 Te 3 journal, June 2019

Projector augmented-wave method journal, December 1994

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

Anisotropic Ferromagnet on a Triangular Lattice with Antiferromagnetic Next-Nearest-Neighbor Interactions journal, May 1996

Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set journal, July 1996

Evolution of structural, magnetic, and transport properties in MnBi 2 − x Sb x Te 4 journal, September 2019

Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator journal, March 2013

Magnetic Properties of Fe Cl 2 in Zero Field. I. Excitations journal, April 1972

Determination of the exchange anisotropy in perovskite antiferromagnets using powder inelastic neutron scattering journal, November 2008

Experimental Realization of an Intrinsic Magnetic Topological Insulator * journal, June 2019

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Electron-energy-loss spectra and the structural stability of nickel oxide: An LSDA+U study journal, January 1998

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Quantum anomalous Hall effect in intrinsic magnetic topological insulator MnBi 2 Te 4 journal, January 2020

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Magnetic anisotropy in low-dimensional ferromagnetic systems: Fe monolayers on Ag(001), Au(001), and Pd(001) substrates journal, September 1990

Ground State Spin Configurations of the Triangular Ising Net with the First, Second and Third Nearest Neighbor Interactions journal, May 1976

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Title: Competing Magnetic Interactions in the Antiferromagnetic Topological Insulator MnBi₂Te₄

Generalized Gradient Approximation Made Simple
journal, October 1996

Spin-wave measurements on hexagonal $MnTe$ of $NiAs$ -type structure by inelastic neutron scattering
journal, March 2006

Magnetic properties and energy-mapping analysis
journal, January 2013

Magnetic topological insulators
journal, January 2019

High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator
journal, March 2015

Two-dimensional ordering and collective magnetic excitations in the dilute ferromagnetic topological insulator ${({Bi}_{0.95} {Mn}_{0.05})}_{2} {Te}_{3}$
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Projector augmented-wave method
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Gapless Surface Dirac Cone in Antiferromagnetic Topological Insulator ${MnBi}_{2} {Te}_{4}$
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Anisotropic Ferromagnet on a Triangular Lattice with Antiferromagnetic Next-Nearest-Neighbor Interactions
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Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set
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Evolution of structural, magnetic, and transport properties in ${MnBi}_{2 - x} {Sb}_{x} {Te}_{4}$
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Magnetic Properties of Fe ${Cl}_{2}$ in Zero Field. I. Excitations
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