Abstract

The onset of hysteretic behavior in the ac magnetic susceptibility has been measured on cooling the spin glass ${\mathrm{Mn}}_{3}$${\mathrm{Al}}_{2}$${\mathrm{Si}}_{3}$ ${\mathrm{O}}_{12}$ in various dc fields to determine constant-relaxation-time contours in the field-temperature plane. Measurements of this transition line at various frequencies obey dynamic scaling, with an exponent $\ensuremath{\Delta}$ that is consistent with static-scaling exponents for a finite transition temperature.

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