A new Bose operator expansion is discussed for tensor operators in the spin systems with isotropic exchange interaction plus anisotropy. Spin wave theory for a system with planar anisotropy shows that the Goldstone theorem is fulfilled. The new expansion replaces the off diagonal single ion anisotropy by an effective anisotropic two-ion interaction.
|Journal||Physica A: Statistical Mechanics and its Applications|
|Publication status||Published - 1977|
|Event||1976 International Conference on Magnetism - Amsterdam, Netherlands|
Duration: 5 Sep 1976 → 9 Sep 1976
|Conference||1976 International Conference on Magnetism|
|Period||05/09/1976 → 09/09/1976|