The extra-dimension W = kT Ln (t/τ0) of phase space below the spin glass transition : an experimental study of the relaxation of the magnetization at constant field in CuMn

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Abstract
We present experimental evidence obtained in a CuMn spin glass below Tc showing that for a given history of the sample, the totality of the time t and temperature T dependence of the relaxation in a given field can be condensed into a unique master curve of the variable Wc = T Ln (t/τ0). We discuss the implications from a practical and a fundamental point of view. Particular emphasis is put upon the experimental aspects : the predictive power of this scaling is stressed as well as the considerations that experimentalists should not ignore