Magnetic order and spin dynamics in ferroelectric HoMnO3

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

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Abstract

Hexagonal HoMnO3 is a frustrated antiferromagnet (TN = 72 K) ferroelectric (TC = 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 ∥ 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.

Original languageEnglish (US)
Article number087601
JournalPhysical review letters
Volume94
Issue number8
DOIs
StatePublished - Mar 4 2005

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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