Nonequilibrium relaxation study on spin glass model

Ferromagnetic (FM) transition point and universality class of the ± J Ising model on cubic lattice are studied by computer simulation using the nonequilibrium relaxation (NER) method. At FM bond density p between multicritical one pmc and 1, static exponents take universal values which are different from those of p=1 or p=pmc, and they are consistent with the values of the random-fixed point and of the simulations and experiments for diluted Ising systems. The dynamical exponent, however, seems to depend on p and not to be universal, although it may be due to finite-time correction. The estimation of pmc on square lattice is also refined to be 0.8894(9), which is consistent with the Nishimori and Nemotoʹs conjecture, 0.889972 .