Abstract
Signatures of spin-glass freezing such as the appearance of $1/f$ conductance noise, the recovery of universal conductance fluctuations, aging, as well as magnetic and thermal irreversibilities, are detected in mesoscopic wires of ${\mathrm{Cd}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{Te}$:I at millikelvin temperatures. Spectral characteristics of conductance time series are consistent with the droplet model of short-range spin glasses.
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