Monte Carlo simulations show that normalized magnetocaloric response functions collapse onto a single universal curve for square, honeycomb, and triangular Ising lattices in monolayer and bilayer forms.
The Widom line in the Ising model on a decorated bilayer lattice
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abstract
There has been much recent interest devoted to a class of frustrated one-dimensional statistical mechanics lattice models which exhibit sharp thermodynamics. In this work, we study an extension of one of these models to two dimensions; the Ising model on a decorated bilayer lattice. We show that the pseudo-transitions of the one-dimensional models become a real first order phase transition in this two-dimensional analogue. Moreover, the pseudo-transition is found to still exist above a bi-critical point. This can be characterised as a Widom line, which allows a re-interpretation of the physics in the previously studied one-dimensional models.
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cond-mat.stat-mech 1years
2026 1verdicts
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Universal Scaling of the Magnetocaloric Effect in 2D Ising Monolayers and Bilayer
Monte Carlo simulations show that normalized magnetocaloric response functions collapse onto a single universal curve for square, honeycomb, and triangular Ising lattices in monolayer and bilayer forms.