Extraction of the Spin Glass Correlation Length
Abstract
The peak of the spin glass relaxation rate, S(t)=d-MTRM(t,tw)/H/d ln t, 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 Ez=NsXfcH2 by which the barrier heights are reduced, where Xfc 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, Ksi(t,T), for Cu:Mn 6at.% and CdCr1.7In0.3S4. Fits to power law dynamics, Ksi(t,T) tα(T) and activated dynamics Ksi(t,T) ln t1/psi compare well with simulation fits, but possess too small a prefactor for activated dynamics.
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