Enhancement of structural rearrangement in glassy systems under shear flow

Details Enhancement of structural rearrangement in glassy systems under shear flow Enhancement of structural rearrangement in glassy systems under shear flow

1999-11-29

arxiv.org/abs/cond-mat/9911460v2

Physics

Condensed Matter

Statistical Mechanics

8 pages, 3 figures, changed content Pacs{64}{70.Pf}{Glass transitions} Pacs{05}{70.Ln}{Non-equilibrium thermodynamics, irrever

Scientific paper

10.1209/epl/i2000-00441-9

We extend the analysis of the mean field schematic model recently introduced for the description of glass forming liquids to the case of a supercooled fluid subjected to a shear flow of rate $\gamma$. After quenching the system to a low temperature $T$, a slow glassy regime is observed before stationarity is achieved at the characteristic time $\tau_g$. $\tau_g$ is of the order of the usual equilibration time without shear $\tau_g^o$ for weak shear, $\gamma \tau_g ^o<1$. For larger shear, $\gamma \tau_g ^o>1$, local rearrangement of dense regions is instead enhanced by the flow, and $\tau_g \simeq 1/(T\gamma)$.

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