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Decoupling of Self‐Diffusion and Structural Relaxation during a Fragile‐to‐Strong Crossover in a Kinetically Constrained Lattice Gas
Author(s) -
Pan Albert C.,
Garrahan Juan P.,
Chandler David
Publication year - 2005
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200400610
Subject(s) - crossover , decoupling (probability) , asymmetry , condensed matter physics , monotonic function , lattice (music) , lattice constant , relaxation (psychology) , chemistry , self diffusion , thermodynamics , statistical physics , physics , materials science , quantum mechanics , mathematics , mathematical analysis , psychology , social psychology , self service , control engineering , artificial intelligence , marketing , computer science , acoustics , engineering , business , diffraction
Decoupling crossover in glass formers : In normal liquids, the self‐diffusion constant, D s , and mean relaxation time, τ α , are inversely proportional. However, in glass formers, D s and τ α are decoupled, and if fragile–strong crossovers exist, D s τ α versus temperature T can be non‐monotonic. The authors illustrate such a decoupling theoretically using an asymmetry parameter b (see figure). A similar behavior is seen in experiment.