Abstract

A probabilistic cluster model, originally proposed by Weron to explain the universal power law of dielectric relaxation, is shown to account for the non-exponential relaxation in spin glasses above T g. Neutron spin echo spectra measured for the cluster glass compound Co 55Ga 45 are well described by the Weron relaxation function, ϕ( t)= ϕ o(1+ k( t/ τ) β ) −1/ k , with the interaction parameter k scaling linearly with the non-Curie–Weiss susceptibility.

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