Abstract
A spin-1 anisotropic ferromagnet with crystal field anisotropy parameter D and biquadratic exchange interaction parameter α (0⩽ α⩽1) has been investigated using the method of double time temperature dependent Green functions. Mixed Callen and RPA decoupling approximations have been utilized. The variations of Curie temperature T C with α for different values of the exchange anisotropy parameter η (0⩽ η⩽1) at D/ J=1 and for different values of D/ J at η=1 have been studied. Also the value of exchange anisotropy parameter for which dependence of T C on α vanishes has been calculated at finite D. Drawbacks and limitations in the earlier calculations have been pointed out.
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