If I understand correctly the original model of Rushbrooke and Wood is applied to ferromagnets. Here is the abstract of the paper:

The paper deals with the high-temperature expansions, in powers of T-1, of the susceptibility, x, and the inverse susceptibility, x-l, for the Heisenberg model of a ferromagnet. Expressions, valid for any lattice, are given for the coefficients in these expansions, up to and including the coefficient of T-5. The results are discussed numerically, for particular lattices, in their bearing on the Curie temperature.

Sorry I forgot to give you the reference. Here it is

G S Rushbrooke and P J Wood 1955 Proc. Phys. Soc. A 68 1161

Dear Chatterji,

but i saw this expression has been applied for antiferromagnetic too.

and can you also explain more about this model? i didnot get the effect of temperature on this model.

how good is this model? what about other models? 

 If you are a theoretical physicists then read the original paper of Rushbrooke and Wood. This paper is extremely technical and the authors have not explained the physical implications very much.

Thanks

The theory of hogh temperature susceptibility of Heisenberg model ferromagnets has been advanced to a high degree of approximation through the extensive development of the exact power-series expansion method of Kramers and Opechwski by Rushbrooke and Wood (R-W). With this technique the susceptibility is expressed as a Taylor series in ascending powers of the reciprocal temperature. The coefficients of the series are evaluated using a systematic and powerful diagrammatic analysis. All coefficients up to sixth power term have been computed by R-W for general spin and different lattices. These six coefficients have been further generalized by Morgan and Rushbrooke (M-R) to include the concentration dependence in ferromagnets with random non-magnetic impuries. The princple restriction of the theory is the assumption of only nearest neighbor interaction. The effect of second nearest neighbor interaction has been calculated by Wojtowicz and Joseph (Phys. Rev. 135, A1314 (1964). All these papers are highly mathematical and computational. If you are really nterested in all these statistical problems then go ahead. As an experimentalist I have no time for these statistical theories.

If you are a theoretician then you should amuse yourself by reading the article of the famous statistical theorist H.E. Stanley, Phys. Rev. 158, 537 (1967). You will see beautiful diagrams there. Good luck!

 I tried to solve  for S=3, the Quadratic Heisenberg parameters of 

(kT(χmax))/(│J│S(S+1))=?

and (χmax│J│)/(Ng^2 〖µB〗^2 )

based on :L.J. De Jongh, A.R. Miedena, Adv. Phys, 23 (1974) 1-260. 

i could not find value. could anybody help me with this?