Abstract
The thermoremanent magnetization of the insulating spin-glass Eu(0.4)Sr(0.6)S has been studied in the range 1.01 Tc down to 0.88 Tc for various initial fields, over 3 decades of time (0.30 – 300 s) by means of Faraday rotation. Within our accuracy, the decay of the TRM is well characterized by a stretched exponential law
We have studied the variation of the parameters n and τ as a function of the temperature and field. Besides the well known acceleration of the decay with increasing initially applied fields, our results in the weakest field H = 0.2 Oe exhibit a clear-cut anomaly right at the temperature Tc(H) where the transition is expected to occur in the field H = 0.2 Oe, as determined from our previous dynamical measurements. It suggests a characteristic field scale for a spin-glass which defines the field range over which linear response theory may be applicable.
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References
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Bontemps, N. (1987). Dynamics across the transition line in the insulating spin-glass Eu(0.4)Sr(0.6)S. In: van Hemmen, J.L., Morgenstern, I. (eds) Heidelberg Colloquium on Glassy Dynamics. Lecture Notes in Physics, vol 275. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0057511
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DOI: https://doi.org/10.1007/BFb0057511
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