Equilibrium and off-equilibrium simulations of chiral-glass order in three-dimensional Heisenberg spin glasses
arXiv:cond-mat/9805118 · doi:10.1016/S0304-8853(97)00436-8
Abstract
Spin-glass and chiral-glass orderings in three-dimensional Heisenberg spin glasses are studied both by equilibrium and off-equilibrium Monte Carlo simulations. Fully isotropic model is found to exhibit a finite-temperature chiral-glass transition without the conventional spin-glass order. Although chirality is an Ising-like quantity from symmetry, universality class of the chiral-glass transition appears to be different from that of the standard Ising spin glass. In the off-equilibrium simulation, while the spin autocorrelation exhibits only an interrupted aging, the chirality autocorrelation persists to exhibit a pronounced aging effect reminisecnt of the one observed in the mean-field model. Effects of random magnetic anisotropy is also studied by the off-equilibrium simulation, in which asymptotic mixing of the spin and the chirality is observed.
15 pages including 8 figures, plain Tex, to appear in Computer Simulation Studies in Condensed Matter Physics XI, Springer, 1998