Entropic Necks, Dynamic Crossovers, and Fragility in Supercooled Liquids (opens in new tab)

The dramatic slowdown of dynamics in supercooled liquids is accompanied by a sequence of dynamical crossovers, most notably the transition from high-temperature collision-dominated transport to low-temperature activated structural relaxation. A particularly striking manifestation of this change is the crossover from Rosenfeld excess-entropy scaling to the Adam--Gibbs relation. In this work we develop a theoretical framework based on a configurat...