The microcanonical phase diagram of the infinite-range Blume-Emery-Griffiths model with negative biquadratic coupling has a fourth-order critical point at parameters different from the canonical one, with reentrant first-order transitions.
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Ensemble inequivalence in the Blume-Emery-Griffiths model near a fourth order critical point
The microcanonical phase diagram of the infinite-range Blume-Emery-Griffiths model with negative biquadratic coupling has a fourth-order critical point at parameters different from the canonical one, with reentrant first-order transitions.