Green function theory of anisotropic Heisenberg Ferromagnet with biquadratic exchange

Abstract

The effects of biquadratic exchange interaction and the uniaxial anisotropy on the curie temperature of the Heisenberg Ferromagnet with spin-one has been studied. Green function technique with random phase approximation has been used. The variation of curie temperature with biquadratic and anisotropic parameters for different lattices has been discussed. © 1982 Springer-Verlag.