| Issue |
Europhys. Lett.
Volume 69, Number 4, February 2005
|
|
|---|---|---|
| Page(s) | 563 - 569 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2004-10376-1 | |
| Published online | 14 January 2005 | |
Intermittency, aging and extremal fluctuations
1
Theoretical Physics - 1 Keble Rd, Oxford OX1 3NP, UK
2
Department of Mathematics, Imperial College London South Kensington Campus, London SW7 2AZ, UK
Received:
16
September
2004
Accepted:
7
December
2004
Aging in spin glasses is analyzed via the probability density
function (PDF) of the heat transfer over a short time 
between system and heat bath. The PDF contains a Gaussian part,
describing reversible fluctuations, and an exponential
“intermittent” tail. We find that the relative weight of these
two parts depends, for fixed , on the ratio of the
total sampling time t to the age tw. Fixing this ratio, the
intensity of the intermittent events is proportional to 
and independent of the temperature. The Gaussian part has a
variance with the same temperature dependence as the variance of
the equilibrium energy in a system with an exponential density of
states. All these observations are explained assuming that for
any tw, intermittent events are triggered by local energy
fluctuations exceeding those previously occurred.
PACS: 65.60.+a – Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc / 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 75.10.Nr – Spin-glass and other random models
© EDP Sciences, 2005
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