Spin 1 frustrated antiferromagnet with biquadratic exchange and single ion anisotropy

The zero temperature properties, using the bond operator technique, are determined for the frustrated S=1 Heisenberg antiferromagnetic model plus nearest-neighbor biquadratic exchange interaction and single ion anisotropy on a two dimensional square lattice.

► The quantum phase transition was studied.
► The phase diagram at T=0 was presented.
► The spin-wave dispersion, for some values of the parameters, was shown.