A universal origin for secondary relaxations in supercooled liquids and structural glasses

Details A universal origin for secondary relaxations in supercooled liquids and structural glasses A universal origin for secondary relaxations in supercooled liquids and structural glasses

2009-05-13

arxiv.org/abs/0905.2152v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

Nearly all glass forming liquids display secondary relaxations, dynamical modes seemingly distinct from the primary alpha relaxations. We show that accounting for driving force fluctuations and the diversity of reconfiguring shapes in the random first order transition theory yields a low free energy tail on the activation barrier distribution which shares many of the features ascribed to secondary relaxations. While primary relaxation takes place through activated events involving compact regions, secondary relaxation corresponding to the tail is governed by more ramified, string-like, or percolation-like clusters of particles. These secondary relaxations merge with the primary relaxation peak becoming dominant near the dynamical crossover temperature $T_c$, where they smooth the transition between continuous dynamics described by mode-coupling theory and activated events.

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