Green's function theory of biquadratic exchange in a heisenberg ferromagnet |
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Authors: | K G Chakraborty |
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Institution: | 1. Department of Physics, Basirhat College, West Bengal, India
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Abstract: | In this paper the effect of biquadratic exchange on Curie temperature has been discussed on the basis of double-time temperature-dependent Green-function formalism with the utilization of Callen decoupling scheme. Calculation has been done for a spin-1 bcc Heisenberg ferromagnet by the method of Flax and Raich and it has been observed that the variation of Curie temperature with the biquadratic exchange parameter α obeys a law prescribed by the previous authors. |
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