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Off-equilibrium fluctuation-dissipation relation in a spin glass

  • Mathematics


We report new experimental results obtained on the insulating spin glass CdCr 2-2x In 2x S 4. Our experimental setup allows a quantitative comparison between the thermo-remanent magnetisation and the autocorrelation of spontaneous fluctuations of magnetisation, yielding a complete determination of the fluctuation-dissipation relation. The dynamics can be studied both in the quasi-equilibrium regime, where the fluctuation-dissipation theorem holds, and in the deeply ageing regime. The limit of separation of time-scales, as used in analytical calculations, can be approached by use of a scaling procedure. Copyright Springer-Verlag Berlin/Heidelberg 2004

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