Posted by Steve Simon on June 8, 2015, 12:07 pm, in reply to "Q4 2013 paper "
No, this does not require mean field theory. The catch is that the spin is not spin 1/2, it is spin J. So when you write the partition function, you need to sum over not just m=-1/2, +1/2, but m = -J, ...., +J. But yes, this part of the question is for a simple paramagnet.
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