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

Abstract

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.

Authors:
 [1];  [2];  [3];  [3];  [3];  [3];  [4];  [5];  [6];  [3]
+ Show Author Affiliations
  1. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. RIKEN, Saitama (Japan)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Univ. of Tennessee, Knoxville, TN (United States)
  6. Univ. of Tennessee, Knoxville, TN (United States); Florida State Univ., Tallahassee, FL (United States)
Publication Date:
Research Org.:
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 Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1267056
Alternate Identifier(s):
OSTI ID: 1239430
Grant/Contract Number:  
AC05-00OR22725; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 116; Journal Issue: 8; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Ma, Jie, Kamiya, Yoshitomo, Hong, Tao, Cao, H. B., Ehlers, Georg, Tian, Wei, Batista, C. D., Dun, Z. L., Zhou, H. D., and Matsuda, Masaaki. Static and dynamical properties of the spin-1/2 equilateral triangular-lattice antiferromagnet Ba3CoSb2O9. United States: N. p., 2016. Web. doi:10.1103/PhysRevLett.116.087201.
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Ma, Jie, Kamiya, Yoshitomo, Hong, Tao, Cao, H. B., Ehlers, Georg, Tian, Wei, Batista, C. D., Dun, Z. L., Zhou, H. D., & Matsuda, Masaaki. Static and dynamical properties of the spin-1/2 equilateral triangular-lattice antiferromagnet Ba3CoSb2O9. United States. https://doi.org/10.1103/PhysRevLett.116.087201
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Ma, Jie, Kamiya, Yoshitomo, Hong, Tao, Cao, H. B., Ehlers, Georg, Tian, Wei, Batista, C. D., Dun, Z. L., Zhou, H. D., and Matsuda, Masaaki. Wed . "Static and dynamical properties of the spin-1/2 equilateral triangular-lattice antiferromagnet Ba3CoSb2O9". United States. https://doi.org/10.1103/PhysRevLett.116.087201. https://www.osti.gov/servlets/purl/1267056.
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@article{osti_1267056,
title = {Static and dynamical properties of the spin-1/2 equilateral triangular-lattice antiferromagnet Ba3CoSb2O9},
author = {Ma, Jie and Kamiya, Yoshitomo and Hong, Tao and Cao, H. B. and Ehlers, Georg and Tian, Wei and Batista, C. D. and Dun, Z. L. and Zhou, H. D. and Matsuda, Masaaki},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.116.087201},
journal = {Physical Review Letters},
number = 8,
volume = 116,
place = {United States},
year = {Wed Feb 24 00:00:00 EST 2016},
month = {Wed Feb 24 00:00:00 EST 2016}
}
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https://doi.org/10.1103/PhysRevLett.116.087201
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    Works referencing / citing this record:

    Field induced spontaneous quasiparticle decay and renormalization of quasiparticle dispersion in a quantum antiferromagnet
    journal, May 2017

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    • Nature Communications, Vol. 8, Issue 1
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    Continuous excitations of the triangular-lattice quantum spin liquid YbMgGaO4
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    • Paddison, Joseph A. M.; Daum, Marcus; Dun, Zhiling
    • Nature Physics, Vol. 13, Issue 2
    • DOI: 10.1038/nphys3971

    Structure of the magnetic excitations in the spin-1/2 triangular-lattice Heisenberg antiferromagnet Ba3CoSb2O9
    journal, August 2017

    The nature of spin excitations in the one-third magnetization plateau phase of Ba3CoSb2O9
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    Field-tunable quantum disordered ground state in the triangular-lattice antiferromagnet NaYbO2
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    Quantum magnetisms in uniform triangular lattices Li2AMo3O8 (A = In, Sc)
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    The cold neutron chopper spectrometer at the Spallation Neutron Source—A review of the first 8 years of operation
    journal, September 2016

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    journal, July 2018

    Topological magnon bands and unconventional thermal Hall effect on the frustrated honeycomb and bilayer triangular lattice
    journal, August 2017

    Effects of interlayer and bi-quadratic exchange coupling on layered triangular lattice antiferromagnets
    journal, January 2020

    • Li, M.; Plumer, M. L.; Quirion, G.
    • Journal of Physics: Condensed Matter, Vol. 32, Issue 13
    • DOI: 10.1088/1361-648x/ab5ea6

    Quantum spin liquid ground state in the disorder free triangular lattice NaYbS 2
    journal, December 2019

    Semiclassical dynamics of spin density waves
    journal, January 2018

    Quantum magnetic properties of the spin- 1 2 triangular-lattice antiferromagnet Ba 2 La 2 CoTe 2 O 12
    journal, November 2018

    Continuous excitations of the triangular-lattice quantum spin liquid YbMgGaO4
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    Semiclassical dynamics of spin density waves
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    Quantum Magnetism in Minerals
    text, January 2018

    Exotic magnetic field-induced spin-superstructures in a mixed honeycomb triangular lattice system
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    Quantum magnetisms in uniform triangular lattices Li2AMo3O8 (A = In, Sc)
    text, January 2019

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