Static and Dynamical Properties of the Spin-1/2 Equilateral Triangular-Lattice Antiferromagnet Ba$_3$CoSb$_2$O$_9$

J. Ma; Y. Kamiya; Tao Hong; H. B. Cao; G. Ehlers; W. Tian; C. D. Batista; Z. L. Dun; H. D. Zhou; M. Matsuda

doi:10.1103/PhysRevLett.116.087201

Static and Dynamical Properties of the Spin-1/2 Equilateral Triangular-Lattice Antiferromagnet Ba$_3$CoSb$_2$O$_9$

Strongly Correlated Electrons 2016-03-02 v2

Authors: J. Ma , Y. Kamiya , Tao Hong , H. B. Cao , G. Ehlers , W. Tian , C. D. Batista , Z. L. Dun , H. D. Zhou , M. Matsuda

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Abstract

We present single-crystal neutron scattering measurements of the spin-1/2 equilateral triangular lattice antiferromagnet Ba $_3$ CoSb $_2$ O $_9$ . Besides confirming that the Co $^{2+}$ magnetic moments lie in the ab plane for zero magnetic field, we determine all the exchange parameters of the minimal quasi-2D spin Hamiltonian, which confirms that Ba $_3$ CoSb $_2$ O $_9$ is an almost perfect realization of the paradigmatic model of frustrated quantum magnetism. A comparison with linear and nonlinear spin-wave theory reveals that quantum fluctuations induce a strong downward renormalization of the magnon dispersion.

Keywords

triangular lattice antiferromagnet Ba3CoSb2O9 neutron scattering spin Hamiltonian quantum fluctuations magnon dispersion geometrical frustration

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@article{arxiv.1507.05702,
  title  = {Static and Dynamical Properties of the Spin-1/2 Equilateral Triangular-Lattice Antiferromagnet Ba$_3$CoSb$_2$O$_9$},
  author = {J. Ma and Y. Kamiya and Tao Hong and H. B. Cao and G. Ehlers and W. Tian and C. D. Batista and Z. L. Dun and H. D. Zhou and M. Matsuda},
  journal= {arXiv preprint arXiv:1507.05702},
  year   = {2016}
}

Comments

8 pages, 7 figures, with supplementary

Static and Dynamical Properties of the Spin-1/2 Equilateral Triangular-Lattice Antiferromagnet Ba$_3$CoSb$_2$O$_9$

Abstract

Keywords

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