Self-consistent approximation for dimerization of ferrimagnets on chains and square lattices

Thermal Properties of Ferrimagnetic Systems

“…As noted above, there was no remarkable improvement in the results at non-zero temperatures when linear spin wave theory was modified either by introducing a Takahashi constraint [7] or by including higher order corrections in the spin wave theory [1,2]. Nor were the results at zero temperature any more improved by considering non-linear spin wave theory [14]. The LSW theory is therefore expected to be valid in obtaining qualitative results even in the presence of dimerization and frustration in the thermodynamic limit.…”