Abstract
The canonical phase diagram of the Blume-Emery-Griffiths model with infinite-range interactions is known to exhibit a fourth-order critical point at some negative value of the biquadratic interaction K<0. Here we study the microcanonical phase diagram of this model for K<0, extending previous studies which were restricted to positive K. A fourth-order critical point is found to exist at coupling parameters which are different from those of the canonical ensemble. The microcanonical phase diagram of the model close to the fourth-order critical point is studied in detail revealing some distinct features from the canonical counterpart.
Original language | English |
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Number of pages | 9 |
Journal | Physical review. E |
Volume | 100 |
Issue number | 052135 |
DOIs | |
Publication status | Published - Nov 2019 |
Keywords
- Computational physics
- Theoretical models
- Physics