CaMn 2Sb 2: Spin waves on a frustrated antiferromagnetic honeycomb lattice
Here we present inelastic neutron scattering measurements of the antiferromagnetic insulator , 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 J 1 and J 2 in the Mn plane and also an exchange interaction between planes. The determined ratio J 2/J 1 ≈ 1/6 suggests that 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.
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- 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:
- 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
- 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)
- Research Org:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
- Sponsoring Org:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
- OSTI Identifier:
- 1226029
- Alternate Identifier(s):
- OSTI ID: 1182460; OSTI ID: 1261437; OSTI ID: 1265506
- Free Publicly Accessible Full Text
- Accepted Manuscript (Publisher)
-
Accepted Manuscript (DOE)
- Publisher's Version of Record
- https://doi.org/10.1103/PhysRevB.91.180407