A dramatic increase in the width of the exchange-narrowed paramagnetic resonance line in Cu₇₅{Mn}₂₅$ is reported and shown to result from the critical dynamics of the spin-glass transition. The divergence of the linewidth as ${({T}f{-}T)}^{{-}1}$ is the first observation of power-law behavior at the spin-freezing temperature.
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Salamon et al. (1978) studied this question.
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