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Extraction of the Spin Glass Correlation Length | Y.G. Joh
; R. Orbach
; G.G. Wood
; J. Hammann
; E. Vincent
; | Date: |
18 Sep 1998 | Journal: | Phys. Rev. Lett. 82, 438 (1999) | Subject: | Disordered Systems and Neural Networks; Statistical Mechanics | cond-mat.dis-nn cond-mat.stat-mech | Abstract: | The peak of the spin glass relaxation rate, S(t)=d{-M_{TRM}(t,t_w)}/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 E_z={N_s}{X_fc}{H^2} by which the barrier heights are reduced, where X_{fc} is the field cooled susceptibility per spin, and N_s is the number of correlated spins. The shift of the peak of S(t) gives E_z, generating the correlation length, Ksi(t,T), for Cu:Mn 6at.% and CdCr_{1.7}In_{0.3}S_4. Fits to power law dynamics, Ksi(t,T)propto {t}^{alpha(T)} and activated dynamics Ksi(t,T) propto {ln t}^{1/psi} compare well with simulation fits, but possess too small a prefactor for activated dynamics. | Source: | arXiv, cond-mat/9809246 | Services: | Forum | Review | PDF | Favorites |
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