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

Journal Article · Thu May 21 20:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI: https://doi.org/10.1103/PhysRevB.91.180407 · OSTI ID:1226029

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)

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 the first 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 N´eel phase and two different spiral phases coexist. The magnitude of the determined exchange interactions reveal a mean field ordering temperature ≈ 4 times larger than the reported N´eel temperature T_N = 85 K, suggesting significant frustration arising from proximity to the tricritical point.

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

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

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

OSTI ID:: 1226029

Report Number(s):: BNL--108226-2015-JA; KC0201060; KC0202020

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 18 Vol. 91; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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