Monte Carlo study of Griffiths phase dynamics in dilute ferromagnets
S G W Colborne; A J Bray; S G W Colborne; Dept. of Theor. Phys., Manchester Univ., UK; A J Bray; Dept. of Theor. Phys., Manchester Univ., UK
Журнал:
Journal of Physics A: Mathematical and General
Дата:
1989-07-07
Аннотация:
The asymptotic dynamics of the spin autocorrelation function is studied in the Griffiths phase of bond-dilute Ising and Heisenberg ferromagnets by Monte Carlo simulation, for simple relaxational dynamics (model A). Systems above, at and below the percolation threshold are studied. Relaxation is non-exponential in all cases. Agreement with theoretical predictions based on clustering arguments is excellent for the Heisenberg systems, less so for the Ising systems.
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