Abstract
A new decoupling of the Green functions in a Heisenberg ferromagnet is proposed, based on an identity derived from the Dyson transformation. The decoupling scheme introduces a new decoupling parameter (in addition to that of Callen) lambda which has been chosen empirically by means of a modified Tahir-Kheli expression for the Curie temperature. The results for the Curie temperature are calculated for SC, BCC and FCC lattices. It is seen that for a wide range of spin values the results agree very closely with the Pade approximant results. The agreement is much better than that of previous decoupling schemes.
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