Abstract
The zero-field spin relaxation of positive muon is measured in spin-glasses $\mathrm{Au}\mathrm{Fe}$ and $\mathrm{Cu}\mathrm{Mn}$. A stochastic theory of muon spin relaxation in a random dilute spin system is formulated to deduce the correlation time of Fe (or Mn) moments. The observed correlation time increases rapidly from ${10}^{\ensuremath{-}10}$ sec (at $T\ensuremath{\sim}1.2{T}_{g}$) to ${10}^{\ensuremath{-}5}$ sec (at $T\ensuremath{\sim}0.5{T}_{g}$), showing a sharp slowing down of spin fluctuation around ${T}_{g}$.
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