Static and dynamical properties of the spin-1/2 equilateral triangular-lattice antiferromagnet Ba3CoSb2O9

Ma, Jie; Kamiya, Yoshitomo; Hong, Tao; Cao, H. B.; Ehlers, Georg; Tian, Wei; Batista, C. D.; Dun, Z. L.; Zhou, H. D.; Matsuda, Masaaki

doi:10.1103/PhysRevLett.116.087201

Title: Static and dynamical properties of the spin-1/2 equilateral triangular-lattice antiferromagnet Ba₃CoSb₂O₉

Journal Article · Wed Feb 24 00:00:00 EST 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.116.087201· OSTI ID:1267056

Ma, Jie ^[1]; Kamiya, Yoshitomo ^[2]; Hong, Tao ^[3]; Cao, H. B. ^[3]; Ehlers, Georg ^[3]; Tian, Wei ^[3]; Batista, C. D. ^[4]; Dun, Z. L. ^[5]; Zhou, H. D. ^[6]; Matsuda, Masaaki ^[3]

Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
RIKEN, Saitama (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Florida State Univ., Tallahassee, FL (United States)

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. Hence, 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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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); 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:: AC05-00OR22725; AC52-06NA25396

OSTI ID:: 1267056

Alternate ID(s):: OSTI ID: 1239430

Journal Information:: Physical Review Letters, Vol. 116, Issue 8; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 132 works

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