Bose Operator Expansions of Tensor Operators in the Theory of Magnetism

Per-Anker Lindgård, A. Kowalska

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    For pt.I see ibid., vol.7, p.1523 (1974). The matching of matrix element method is used to find a new self-consistent Bose operator expansion for tensor operators in spin systems with isotropic exchange interaction plus anisotropy. Tables are given for all tensor operators relevant for cubic and hexagonal symmetry. A discussion of renormalized spin-wave theory for a system with planar anisotropy shows that the Goldstone theorem is rigorously fulfilled to the considered order of perturbation. It is finally shown that the new expansion introduces wavevector-dependent terms from the single-ion anisotropy into the dispersion relation.
    Original languageEnglish
    JournalJournal of Physics C: Solid State Physics
    Issue number11
    Pages (from-to)2081-2092
    Publication statusPublished - 1976


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