Instability of Magnons in Two-dimensional Antiferromagnet at High Magnetic Fields

T. Masuda; S. Kitaoka; S. Takamizawa; N. Metoki; K. Kaneko; K. C. Rule; K. Kiefer; H. Manaka; H. Nojiri

doi:10.1103/PhysRevB.81.100402

Instability of Magnons in Two-dimensional Antiferromagnet at High Magnetic Fields

Strongly Correlated Electrons 2015-05-18 v1

Authors: T. Masuda , S. Kitaoka , S. Takamizawa , N. Metoki , K. Kaneko , K. C. Rule , K. Kiefer , H. Manaka , H. Nojiri

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Abstract

Spin dynamics of the square lattice Heisenberg antiferromagnet, \BaMnGeO, is studied by a combination of bulk measurements, neutron diffraction, and inelastic neutron scattering techniques. Easy plane type antiferromagnetic order is identified at $T \le 4.0$ K. The exchange interactions are estimated as $J_1$ = 27.8(3) ${\mu}$ eV and $J_2$ = 1.0(1) ${\mu}$ eV, and the saturation field $H_{\rm C}$ is 9.75 T. Magnetic excitation measurements with high experimental resolution setup by triple axis neutron spectrometer reveals the instability of one magnon excitation in the field range of $0.7H_{\rm C} \lesssim H \lesssim 0.85H_{\rm C}$ .

Keywords

magnon instability two-dimensional antiferromagnet high magnetic fields square lattice Heisenberg antiferromagnet inelastic neutron scattering spin dynamics

Cite

@article{arxiv.1002.2470,
  title  = {Instability of Magnons in Two-dimensional Antiferromagnet at High Magnetic Fields},
  author = {T. Masuda and S. Kitaoka and S. Takamizawa and N. Metoki and K. Kaneko and K. C. Rule and K. Kiefer and H. Manaka and H. Nojiri},
  journal= {arXiv preprint arXiv:1002.2470},
  year   = {2015}
}

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5 pgase, 5 figuers, to be published in PRB RC

Instability of Magnons in Two-dimensional Antiferromagnet at High Magnetic Fields

Abstract

Keywords

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