Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2006-07-31
Phys. Rev. Lett. 98, 187801 (2007)
Physics
Condensed Matter
Disordered Systems and Neural Networks
4 pages, 3 figures, final version accepted in PRL
Scientific paper
10.1103/PhysRevLett.98.187801
According to the mosaic scenario, relaxation in supercooled liquids is ruled by two competing mechanisms: surface tension, opposing the creation of local excitations, and entropy, providing the drive to the configurational rearrangement of a given region. We test this scenario through numerical simulations well below the Mode Coupling temperature. For an equilibrated configuration, we freeze all the particles outside a sphere and study the thermodynamics of this sphere. The frozen environment acts as a pinning field. Measuring the overlap between the unpinned and pinned equilibrium configurations of the sphere, we can see whether it has switched to a different state. We do not find any clear evidence of the mosaic scenario. Rather, our results seem compatible with the existence of a single (liquid) state. However, we find evidence of a growing static correlation length, apparently unrelated to the mosaic one.
Cavagna Andrea
Grigera Tomas S.
Verrocchio Paolo
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