Zusammenfassung
Dynamical universality classes of bcc and fcc Ising models, and
triangular and honeycomb three states Potts models are numerically studied
with the nonequilibrium relaxation analysis1.
The local exponents $Ľlambda$ ($=ĽfracĽbetazĽnu$) of the three dimensional Ising model are 0.251(4) (bcc), 0.257(7) (fcc)
and these values are identical with that of simple cubic lattice
within the error bars.
Here $Ľbeta$, $Ľnu$ and $z$ are the critical exponents of
the order parameter, correlation length and dynamical critical exponent, respectively.
The dynamical critical exponents of the two dimensional Potts models are
2.188(4) (sq), 2.202(14) (tri), 2.198(4) (hc).
These values are consistent with the previous work2
and the dynamical universality is confirmed.
In addition, the Ising model with alternating coupling constant on square lattice
(model 1)
and the Ising model with frustration on square lattice (model 2) is also studied
(see Figure).
Model 1 has two positive alternating coupling constant $J_1,J_2$
and they are alternately configured.
Model 2 has two coupling constans $J$ and $-J$ and
anti-ferro bonds are distributed at regular intervals with the ratio of 1/16.
Again the dynamical universality is confirmed in these models
and this suggests that the modification to the bond strength without randomness
do not affect the dynamical critical universality.
1) N. Ito, Physica A, 196, 591 (1993)\\
2) L. Schulke and B. Zheng, Phys. Lett. A, 204, 295 (1995)\\
3) F.-G. Wang and C.-K. Hu, Phys. Rev. E, 56, 2310 (1997)
Nutzer