Fluctuation-dissipation ratio of a spin glass in the aging regime

Details Fluctuation-dissipation ratio of a spin glass in the aging regime Fluctuation-dissipation ratio of a spin glass in the aging regime

2001-12-20

arxiv.org/abs/cond-mat/0112378v2

Physical Review Letters 88, 257202 (2002)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.88.257202

We present the first experimental determination of the time autocorrelation $C(t',t)$ of magnetization in the non-stationary regime of a spin glass. Quantitative comparison with the response, the magnetic susceptibility $\chi(t',t)$, is made using a new experimental setup allowing both measurements in the same conditions. Clearly, we observe a non-linear fluctuation-dissipation relation between $C$ and $\chi$, depending weakly on the waiting time $t'$. Following theoretical developments on mean-field models, and lately on short range models, it is predicted that in the limit of long times, the $\chi(C)$ relationship should become independent on $t'$. A scaling procedure allows us to extrapolate to the limit of long waiting times.

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