CaMn2Sb2: Spin waves on a frustrated antiferromagnetic honeycomb lattice

McNally, D. E.; Simonson, J. W.; Kistner-Morris, J. J.; Smith, G. J.; Hassinger, J. E.; DeBeer-Schmidt, L.; Kolesnikov, A. I.; Zaliznyak, I.; Aronson, M. C.

doi:10.1103/PhysRevB.91.180407

Title: CaMn₂Sb₂: Spin waves on a frustrated antiferromagnetic honeycomb lattice

Abstract

Here we present inelastic neutron scattering measurements of the antiferromagnetic insulator ${CaMn}_{2} {Sb}_{2}$ , which consists of corrugated honeycomb layers of Mn. The dispersion of magnetic excitations has been measured along the H and L directions in reciprocal space, with a maximum excitation energy of ≈ 24 meV. These excitations are well described by spin waves in a Heisenberg model, including first-and second-neighbor exchange interactions J₁ and J₂ in the Mn plane and also an exchange interaction between planes. The determined ratio J₂/J₁ ≈ 1/6 suggests that ${CaMn}_{2} {Sb}_{2}$ is an example of a compound that lies very close to the mean field tricritical point, known for the classical Heisenberg model on the honeycomb lattice, where the Néel phase and two different spiral phases coexist. Lastly, the magnitude of the determined exchange interactions reveals a mean field ordering temperature ≈ 4 times larger than the reported Néel temperature T_N = 85 K, suggesting significant frustration arising from proximity to the tricritical point.

Authors:

McNally, D. E. ^[1]; Simonson, J. W. ^[1]; Kistner-Morris, J. J. ^[1]; Smith, G. J. ^[1]; Hassinger, J. E. ^[1]; DeBeer-Schmidt, L. ^[2]; Kolesnikov, A. I. ^[2]; Zaliznyak, I. ^[3]; Aronson, M. C. ^[4]

Stony Brook Univ., NY (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)

Publication Date:: Fri May 22 00:00:00 EDT 2015

Research Org.:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1226029

Alternate Identifier(s):: OSTI ID: 1182460; OSTI ID: 1261437; OSTI ID: 1265506

Report Number(s):: BNL-108226-2015-JA
Journal ID: ISSN 1098-0121; R&D Project: PO010; PM009; KC0201060; KC0202020

Grant/Contract Number:: SC00112704; AC02-98CH10886; AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review. B, Condensed Matter and Materials Physics

Additional Journal Information:: Journal Volume: 91; Journal Issue: 18; Journal ID: ISSN 1098-0121

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    McNally, D. E., Simonson, J. W., Kistner-Morris, J. J., Smith, G. J., Hassinger, J. E., DeBeer-Schmidt, L., Kolesnikov, A. I., Zaliznyak, I., and Aronson, M. C. CaMn2Sb2: Spin waves on a frustrated antiferromagnetic honeycomb lattice.  United States: N. p., 2015. 
Web.  doi:10.1103/PhysRevB.91.180407.

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                    McNally, D. E., Simonson, J. W., Kistner-Morris, J. J., Smith, G. J., Hassinger, J. E., DeBeer-Schmidt, L., Kolesnikov, A. I., Zaliznyak, I., & Aronson, M. C. CaMn2Sb2: Spin waves on a frustrated antiferromagnetic honeycomb lattice.  United States.  https://doi.org/10.1103/PhysRevB.91.180407

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                    McNally, D. E., Simonson, J. W., Kistner-Morris, J. J., Smith, G. J., Hassinger, J. E., DeBeer-Schmidt, L., Kolesnikov, A. I., Zaliznyak, I., and Aronson, M. C. Fri .  
"CaMn2Sb2: Spin waves on a frustrated antiferromagnetic honeycomb lattice".  United States.  https://doi.org/10.1103/PhysRevB.91.180407.  https://www.osti.gov/servlets/purl/1226029.

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@article{osti_1226029,

  title        = {CaMn2Sb2: Spin waves on a frustrated antiferromagnetic honeycomb lattice},

  author       = {McNally, D. E. and Simonson, J. W. and Kistner-Morris, J. J. and Smith, G. J. and Hassinger, J. E. and DeBeer-Schmidt, L. and Kolesnikov, A. I. and Zaliznyak, I. and Aronson, M. C.},

  abstractNote = {Here we present inelastic neutron scattering measurements of the antiferromagnetic insulator CaMn2Sb2, which consists of corrugated honeycomb layers of Mn. The dispersion of magnetic excitations has been measured along the H and L directions in reciprocal space, with a maximum excitation energy of ≈ 24 meV. These excitations are well described by spin waves in a Heisenberg model, including first-and second-neighbor exchange interactions J1 and J2 in the Mn plane and also an exchange interaction between planes. The determined ratio J2/J1 ≈ 1/6 suggests that CaMn2Sb2 is an example of a compound that lies very close to the mean field tricritical point, known for the classical Heisenberg model on the honeycomb lattice, where the Néel phase and two different spiral phases coexist. Lastly, the magnitude of the determined exchange interactions reveals a mean field ordering temperature ≈ 4 times larger than the reported Néel temperature TN = 85 K, suggesting significant frustration arising from proximity to the tricritical point.},

  doi          = {10.1103/PhysRevB.91.180407},

  journal      = {Physical Review. B, Condensed Matter and Materials Physics},

  number       = 18,

  volume       = 91,

  place        = {United States},

  year         = {Fri May 22 00:00:00 EDT 2015},

  month        = {Fri May 22 00:00:00 EDT 2015}

}

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Signatures of coupling between spin waves and Dirac fermions in ${YbMnBi}_{2}$
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Title: CaMn2Sb2: Spin waves on a frustrated antiferromagnetic honeycomb lattice

Abstract

Citation Formats

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Disordered Ground State and Magnetic Field-Induced Long-Range Order in an S = 3 / 2 Antiferromagnetic Honeycomb Lattice Compound Bi 3 Mn 4 O 12 ( NO 3 ) journal, October 2010

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Non-simple magnetic order for simple Hamiltonians journal, July 1979

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Origin of the charge gap in LaMnPO
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Long-range magnetic ordering in Na $_{2}$ IrO $_{3}$
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Field-induced dynamical properties of the $XXZ$ model on a honeycomb lattice
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