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Mexican hat potential around spin site (TOPIC: spin models)

  1. May 22, 2009 #1
    I am not sure if I am reading well the following article about KT phase transition in spin systems.
    http://www.itp.uzh.ch/~llucas/projects/proseminar.pdf [Broken]

    Page 5 quotes a theory regarding the Helmholtz free energy function. The curve surrounding a spin site or an atom looks like everyone's best guess on the shape of potential energy.

    Are they saying that Ising spin model with 2 possible spin states or Potts model with several states would have greater free energy?
    Last edited by a moderator: May 4, 2017
  2. jcsd
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