Abstract
We report on a study of the evolution of the structure factor $S(k,t)$ of a binary fluid mixture near the consolute critical point after rapid quenches which kept the system in the stable, one-phase region. $S(k,t)$ always relaxed more slowly than expected on the basis of linear response and, under certain conditions, overshot the equilibrium value. A nonlinear theory without adjustable parameters, based on the Langevin equations for order-parameter fluctuations near the critical point, agreed with the data.
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