Ballauff, M.; Brader, J.M.; Egelhaaf, S.U.; Fuchs, M.; Horbach, J.; Koumakis, N.; Krüger, M.; Laurati, M.; Mutch, K.J.; Petekidis, G.; Siebenbürger, M.; Voigtmann, Th.; Zausch, J.: Residual Stresses in Glasses. Physical Review Letters 110 (2013), p. 215701/1-5
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The history dependence of glasses formed from flow-melted steady states by a sudden cessation of the shear rate γ˙ is studied in colloidal suspensions, by molecular dynamics simulations and by mode-coupling theory. In an ideal glass, stresses relax only partially, leaving behind a finite persistent residual stress. For intermediate times, relaxation curves scale as a function of γ˙t, even though no flow is present. The macroscopic stress evolution is connected to a length scale of residual liquefaction displayed by microscopic mean-squared displacements. The theory describes this history dependence of glasses sharing the same thermodynamic state variables but differing static properties.