Magnetic order and spin dynamics in ferroelectric HoMnO3 |
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| Authors: | Vajk O P Kenzelmann M Lynn J W Kim S B Cheong S-W |
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| Institution: | Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA. |
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| Abstract: | Hexagonal HoMnO3 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 Mn3+ 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 0.28 meV above the spin-reorientation transition at 40 K and 0.38 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 Ho3+ ions are ordered magnetically. |
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