Excitations in a Two-Dimensional Random Antiferromagnet

R. J. Birgeneau, L. R. Walker, H. J. Guggenheim, Jens Aage Als-Nielsen

    Research output: Contribution to journalLetterResearchpeer-review

    Abstract

    Inelastic neutron scattering studies of the magnetic excitations in the planar Heisenberg random antiferromagnet Rb2Mn0.5Ni0.5F4 at 7K are reported. Two well-defined bands of excitations are observed. A simple mean crystal model is found to predict accurately the measured dispersion relations using essentially the pure crystal parameters while the zone boundary energy widths are well-accounted for by an Ising cluster mode. Intensities, however, are not properly explained using these simple models.
    Original languageEnglish
    JournalJOURNAL OF PHYSICS C-SOLID STATE PHYSICS
    Volume8
    Issue number15
    Pages (from-to)L328-L333
    ISSN0022-3719
    DOIs
    Publication statusPublished - 1975

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