Using the 1/N expansion, the authors show that the O(N)×Z2 biconical model in 3≤d<4 has a critical fixed point whose Z2 symmetry remains spontaneously broken at arbitrarily high temperature for large finite N.
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Thermal Order in the Biconical Model
Using the 1/N expansion, the authors show that the O(N)×Z2 biconical model in 3≤d<4 has a critical fixed point whose Z2 symmetry remains spontaneously broken at arbitrarily high temperature for large finite N.