Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2005-01-27
Physics
Condensed Matter
Statistical Mechanics
12 pages, 3 figures; a careful discussion of the spin-glass case in a field added
Scientific paper
10.1103/PhysRevB.72.064204
We argue that for generic systems close to a critical point, an extended Fluctuation-Dissipation relation connects the low frequency non-linear (cubic) susceptibility to the four-point correlation function. In glassy systems, the latter contains interesting information on the heterogeneity and cooperativity of the dynamics. Our result suggests that if the abrupt slowing down of glassy materials is indeed accompanied by the growth of a cooperative length ell, then the non-linear, 3 omega response to an oscillating field should substantially increase and give direct information on the temperature (or density) dependence of ell. The analysis of the non-linear compressibility or the dielectric susceptibility in supercooled liquids, or the non-linear magnetic susceptibility in spin-glasses, should give access to a cooperative length scale, that grows as the temperature is decreased or as the age of the system increases. Our theoretical analysis holds exactly within the Mode-Coupling Theory of glasses.
Biroli Giulio
Bouchaud Jean-Philippe
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