COMPUTER-SIMULATION OF THE CRITICAL-DYNAMICS IN DILUTED MAGNETS

The computer simulation for the critical magnetization relaxation proc esses in the quenched site-diluted 3D Ising model is performed. The 48 x48x48 system with the spin concentration p = 1,0, 0,95, 0,8, 0,6 and 0,4 is analyzed. To determine the dynamic critical exponent z, the Mon te-Carlo method is used together with the dynamic renorm-group method. The values z(p) are determined, z(p) being z(1,0) = 1,97 +/- 0,08, z( 0,95) = 2,19 +/- 0,07, z(0,8) = 2,20 +/- 0,08, z(0,6) = = 2,58 +/- 0,0 9 and z(0,4) = 2,65 +/- 0,12. The hypothesis of the step-like universa lity of the critical exponents in diluted 3D magnets is proposed.