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

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Abstract

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
Volume68
Issue number1
Publication statusPublished - 2003 Jul 1

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Sato, T. J., Lee, S. H., Katsufuji, T., Masaki, M., Park, S., Copley, J. R. D., & Takagi, H. (2003). Unconventional spin fluctuations in the hexagonal antiferromagnet YMnO 3. Physical Review B - Condensed Matter and Materials Physics, 68(1), 144321-144325. [014432].