Phase transitions with four-spin interactions

Details Phase transitions with four-spin interactions Phase transitions with four-spin interactions

2010-06-04

arxiv.org/abs/1006.0959v1

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

Using an extended Lee-Yang theorem and GKS correlation inequalities, we prove, for a class of ferromagnetic multi-spin interactions, that they will have a phase transition(and spontaneous magnetization) if, and only if, the external field $h=0$ (and the temperature is low enough). We also show the absence of phase transitions for some nonferromagnetic interactions. The FKG inequalities are shown to hold for a larger class of multi-spin interactions.

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