Unconventional spin fluctuations in the hexagonal antiferromagnet YMnO3

J. Sato, H. Lee, Takuro Katsufuji, M. Masaki, S. Park, 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
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume68
    Issue number1
    DOIs
    Publication statusPublished - 2003 Jan 1

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    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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