TY - JOUR
TI - Bose Operator Expansions of Tensor Operators in the Theory of Magnetism
LA - eng
AU - LindgĂ„rd, Per-Anker
AU - Kowalska, A.
JF - Journal of Physics C: Solid State Physics
VL - 9
IS - 11
SP - 2081
EP - 2092
PY - 1976
SN - 17473802, 00223719
AB - 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.
DO - 10.1088/0022-3719/9/11/016
ER -