Microscopic origin of the abrupt phase transition (IMAGE)
Caption
Left: A typical trajectory of accepted changes starting from a fully magnetized state (|m| = 1) just above the critical temperature 𝑇𝑐. Initially, small fluctuations occur before the system stabilizes at equilibrium with 𝑚 ≈ 0. Different types of microscopic changes are color-coded: adding a molecule (red), removing a molecule (green), flipping a spin up (yellow), and flipping a spin down (purple). Right: The evolution of the interaction network. Due to the high average connectivity (𝑘=50), most changes involve adding or removing molecules, gradually transforming the network from a very dense state (a) to a sparse final state (d). In this final state, most particles form molecules (red), and macroscopic magnetization disappears.
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