Posted by Steve Simon on June 6, 2015, 6:45 pm, in reply to "Re: Mean Field Theory and Heisenberg Model"
Actually it doesn't matter what the spin is (1/2 ,1 ....). points in the z direction. What matters is how many Sz values are allowed.
Yes, on an exam, it is probably safe to assume spins point in z direction -- for any spin value.
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