Off-equilibrium fluctuation-dissipation relation in a spin glass

D. Hérisson and M. Ocio

The European Physical Journal B: Condensed Matter and Complex Systems, 2004, vol. 40, issue 3, 283-294

Abstract: 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

Date: 2004
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DOI: 10.1140/epjb/e2004-00278-6

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