Posted by Steve Simon on June 6, 2015, 5:12 pm, in reply to "Mott Insulators: Curie paramagnets or antiferromagnets?"
At low enough energy scale, a paramagnet (which assumes no interaction between neighboring spins) is either ferro or antiferro depending on the sign of the interaction. We think of this as a paramagnet if this interaction is very very small (compared to the temperature scale where we are measuring). So for a mott insulator, if hopping is very small, or U is very large then the antiferromagnetism is very weak and you would only see it at very low temperature.
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