Spontaneous trimerization of spin-1 chains

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    Spontaneous trimerization of the one-dimensional spin-l Heisenberg-biquadratic model is discussed in terms of a valence-bond (VB) analysis. A spin-wave theory based on a simple trimer VB state is developed and applied to the model. Within the theory a self-consistent picture is obtained: the system is trimerized for an extended region of couplings, with a non-zero energy gap that collapses at both ends of the region. Agreement with the exact results of Lai and Sutherland is found at one end of the region.
    Original languageEnglish
    Pages (from-to)7489-7502
    Number of pages14
    JournalJournal of Physics: Condensed Matter
    Issue number40
    Publication statusPublished - 1993


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