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Phase transitions from ising model

  1. Nov 18, 2007 #1
    I'm having trouble understanding how changing parameters in the ising model leads to first order phase transitions. I understand how the intersection of
    [itex]\frac{kT}{2nJS} (\eta - \frac{g \mu_o H_o}{kT} ) = B_s(\eta)[/itex]
    where [itex]B_s(\eta)[/itex] is the Brouillion func leads (in the absence of a field H) to one stable state for high T and low T, and how if T is in between this there are three solutions, leading to symmetry breaking. What I don't get is what happens with a magnetic field. Say T is chosen such that we've got three solutions still. The linear component will shift, so one solution will be more stable than the other, but how can you tell which one?
  2. jcsd
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