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Off-equilibrium fluctuation-dissipation relation in a spin glass

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  • D. Hérisson
  • M. Ocio

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

Suggested Citation

  • D. Hérisson & M. Ocio, 2004. "Off-equilibrium fluctuation-dissipation relation in a spin glass," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 40(3), pages 283-294, August.
    • Handle: RePEc:spr:eurphb:v:40:y:2004:i:3:p:283-294
    DOI: 10.1140/epjb/e2004-00278-6
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