Abstract.
We report new experimental results obtained on the insulating spin glass CdCr2-2x In2x S4. 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.
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Received: 2 March 2004, Published online: 9 September 2004
PACS:
05.70.Ln Nonequilibrium and irreversible thermodynamics - 75.50.Lk Spin glasses and other random magnets - 07.20.Dt Thermometers - 07.55.Jg Magnetometers for susceptibility, magnetic moment, and magnetization measurements
D. Hérisson: Present address: Department of Engineering Sciences - Division of Solid State Physics, Uppsala University, 751 21 Uppsala, Sweden
M. Ocio: deceased 21 December 2003
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Hérisson, D., Ocio, M. Off-equilibrium fluctuation-dissipation relation in a spin glass. Eur. Phys. J. B 40, 283–294 (2004). https://doi.org/10.1140/epjb/e2004-00278-6
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DOI: https://doi.org/10.1140/epjb/e2004-00278-6