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

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [1];  [1];  [1];  [1];  [2];  [2];  [3];  [4]
  1. Stony Brook Univ., NY (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)

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 TN = 85 K, suggesting significant frustration arising from proximity to the tricritical point.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC00112704; AC02-98CH10886; AC05-00OR22725
OSTI ID:
1226029
Alternate ID(s):
OSTI ID: 1182460; OSTI ID: 1261437; OSTI ID: 1265506
Report Number(s):
BNL-108226-2015-JA; R&D Project: PO010; PM009; KC0201060; KC0202020
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 18; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Cited By (10)

Signatures of coupling between spin waves and Dirac fermions in YbMnBi 2 journal January 2020
Exotic magnetic field-induced spin-superstructures in a mixed honeycomb triangular lattice system text January 2018
Magnonic analogs of topological Dirac semimetals journal September 2017
Nonmonotonic and anisotropic magnetoresistance effect in antiferromagnet CaMn 2 Bi 2 journal April 2018
Magnonic Analogs of Topological Dirac Semimetals text January 2016
Role of quantum fluctuations on spin liquids and ordered phases in the Heisenberg model on the honeycomb lattice text January 2018
Field-induced dynamical properties of the XXZ model on a honeycomb lattice journal January 2016
Frustrated magnetism in the J 1 J 2 honeycomb lattice compounds MgMn O 3 and ZnMn O 3 synthesized via a metathesis reaction journal December 2019
From Hund's insulator to Fermi liquid: Optical spectroscopy study of K doping in BaMn 2 As 2 journal September 2015
Enhanced magnetopiezoelectric effect at the Néel temperature in CaMn 2 Bi 2 journal August 2019

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