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Phys. Rev. Lett. 82, 438–441 (1999)

Extraction of the Spin Glass Correlation Length

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Y. G. Joh, R. Orbach, and G. G. Wood
Department of Physics, University of California, Riverside, California 92521-0101

J. Hammann and E. Vincent
Service de Physique de l'Etat Condensé, CEA Saclay, 91191 Gif sur Yvette, Cedex, France

Received 18 September 1998; published in the issue dated 11 January 1999

The peak of the spin glass relaxation rate, S(t) = d[-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 Ez = NsχfcH2 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)∝tα(T) and activated dynamics ξ(t,T)∝(lnt)1/ψ compare well with simulation fits but possess too small a prefactor for activated dynamics.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.438
DOI:
10.1103/PhysRevLett.82.438
PACS:
75.50.Lk, 75.10.Nr, 75.40.Gb
 
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