Abstract
Monte-Carlo methods are used to study the nonequilibrium crystalline behavior of disordered magnets described by a three-dimensional Heisenberg model with extended structural defects. The critical temperature and critical indices are calculated: z = 3.529(125), ν = 0.821(14), β = 0.777(53), and ω = 0.882(49). It is shown that Heisenberg magnets with strong disorder and long-range defect correlations form a distinct universality class. A high concentration of structural defects with long-range correlation is found to cause significant slowing down of the critical relaxation dynamics. A study is made of the effects of aging on the nonequilibrium behavior of highly disordered magnets.
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