Off-equilibrium fluctuation-dissipation relation in a spin glass

Physics – Condensed Matter – Disordered Systems and Neural Networks

Scientific paper

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Minor changes, accepted for publication in EPJ-B

Scientific paper

10.1140/epjb/e2004-00278-6

We report new experimental results obtained onthe insulating spin glass CdCrInS_4. Our experimental setup allows a quantitative comparison between thethermo-remanent magnetization and the autocorrelation of spontaneous fluctuations of magnetization, yielding acomplete determination of the fluctuation-dissipationrelation. The dynamics can be studied both in thequasi-equilibrium regime, where the fluctuation-dissipation theorem holds, and in the deeply aging regime. The limit of separation of time-scales, as used in analytical calculations, can be approached by use of a scaling procedure.

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