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I am not sure it is the right subcategory to post a question on statistical physics. But anyway, I read a couple of times that adding a m^3 to the Landau free energy implies that we may observe a first order transition phase, but I don't see why. Maybe it does imply some discontinuity in the entropy, latent heat, but I am not seeing that.

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# Landau theory: why does a m^3 term implies first order transition phase

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