Magnetic Order and Spin Dynamics in Ferroelectric HoMnO$_{3}$

O. P. Vajk; M. Kenzelmann; J. W. Lynn; S. B. Kim; S. -W. Cheong

doi:10.1103/PhysRevLett.94.087601

Magnetic Order and Spin Dynamics in Ferroelectric HoMnO$_{3}$

Strongly Correlated Electrons 2009-11-11 v1

Authors: O. P. Vajk , M. Kenzelmann , J. W. Lynn , S. B. Kim , S. -W. Cheong

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Abstract

Hexagonal HoMnO $_{3}$ is a frustrated antiferromagnet (T $_{N}$ =72 K) ferroelectric (T $_{C}$ =875 K) in which these two order parameters are coupled. Our neutron measurements of the spin wave dispersion for the S=2 Mn $^{3+}$ on the layered triangular lattice are well described by a two-dimensional nearest-neighbor Heisenberg exchange J=2.44 meV, and an anisotropy $D$ that is 0.093 meV above the spin reorientation transition at 40 K, and 0.126 meV below. For $H\parallel c$ the magnetic structures and phase diagram have been determined, and reveal additional transitions below 8 K where the ferroelectrically displaced Ho $^{3+}$ ions are ordered magnetically.

Keywords

HoMnO$_{3}$ magnetic order spin dynamics ferroelectric frustrated antiferromagnet spin wave dispersion

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@article{arxiv.cond-mat/0502006,
  title  = {Magnetic Order and Spin Dynamics in Ferroelectric HoMnO$_{3}$},
  author = {O. P. Vajk and M. Kenzelmann and J. W. Lynn and S. B. Kim and S. -W. Cheong},
  journal= {arXiv preprint arXiv:cond-mat/0502006},
  year   = {2009}
}

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To be published in Physical Review Letters

Magnetic Order and Spin Dynamics in Ferroelectric HoMnO$_{3}$

Abstract

Keywords

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