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The peak of the spin glass relaxation rate, S(t)0ex0ex=0ex0exd[-MTRM(t,tw)/H]/dlnt, is directly related to the typical value of the free energy barrier which can be explored over experimental time scales. A change in magnetic field H generates an energy Ez0ex0ex=0ex0exNₛχfcH² by which the barrier heights are reduced, where χfc is the field cooled susceptibility per spin, and Nₛ is the number of correlated spins. The shift of the peak of $S(t)$ gives Ez, generating the correlation length, ξ(t,T) for Cu:Mn6at.% and CdCr1.7In0.3S₄. Fits to power law dynamics, ξ(t,T)∝t^α(T) and activated dynamics ξ(t,T)∝(lnt)^1/ψ compare well with simulation fits but possess too small a prefactor for activated dynamics.
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Joh et al. (1999) studied this question.
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