Journal
PHYSICAL REVIEW LETTERS
Volume 116, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.087201
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Funding
- Scientific User Facilities Division
- Office of Basic Energy Sciences, U.S. Department of Energy
- NSF-DMR [DMR-1350002]
- NHMFL [NSF-DMR-1157490]
- U.S. DOE
- State of Florida
- RIKEN iTHES project
- U.S. DOE through the LDRD program [DE-AC52-06NA25396]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1350002] Funding Source: National Science Foundation
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We present single-crystal neutron scattering measurements of the spin-1/2 equilateral triangular-lattice antiferromagnet Ba3CoSb2O9. Besides confirming that the Co2+ magnetic moments lie in the ab plane for zero magnetic field and then determining all the exchange parameters of the minimal quasi-2D spin Hamiltonian, we provide conclusive experimental evidence of magnon decay through observation of intrinsic line broadening. Through detailed comparisons with the linear and nonlinear spin-wave theories, we also point out that the large-S approximation, which is conventionally employed to predict magnon decay in noncollinear magnets, is inadequate to explain our experimental observation. Thus, our results call for a new theoretical framework for describing excitation spectra in low-dimensional frustrated magnets under strong quantum effects.
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