Abstract
Utilizing various experimental techniques the dynamics in spin glasses can be studied over more than 17 decades in time. A concordant experimental quantity is the relaxation rate, which in the linear response regime probes the time dependence of the spin-spin time correlation function. Some fundamental experimental observations of the zero-field equilibrium relaxation as well as the influence of aging on the observed relaxation are discussed. It is inferred that the relaxation in spin glasses exhibits a qualitatively universal behaviour.
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