Unconventional spin fluctuations in the hexagonal antiferromagnet YMnO 3

T. J. Sato*, S. H. Lee, T. Katsufuji, M. Masaki, S. Park, J. R.D. Copley, H. Takagi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

83 Citations (Scopus)


We used inelastic neutron scattering to show that well below its Néel temperature, TN, the two-dimensional (2D) XY nearly triangular antiferromagnet YMnO3 has a prominent central peak associated with 2D antiferromagnetic fluctuations with a characteristic lifetime of 0.55(5) ps, coexisting with the conventional long-lived spin waves. Existence of the two time scales suggests competition between the Néel phase favored by weak interplane interactions, and the Kosterlitz-Thouless phase intrinsic to the 2D XY spin system.

Original languageEnglish
Article number014432
Pages (from-to)144321-144325
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number1
Publication statusPublished - 2003 Jul

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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