24 CHAPTER 4. THE MAGNETICALLY ORDERED STATE
Combining this expression with Eq. (4.2.7) leads to
Upon substitution of (Eq. 4.2.5) and into Eq. (4.2.10), one
finds
This is quite an interesting result because it shows that for a given J the variation of
the reduced magnetization M(T)/M(0) with the reduced temperature depends