Dynamical AC study of the critical behavior in Heisenberg spin glasses
Résumé
We present some numerical results for the Heisenberg spin-glass model with Gaussian interactions, in a three dimensional cubic lattice. We measure the AC susceptibility as a function of temperature and determine an apparent finite temperature transition which is compatible with the chiral-glass temperature transition for this model. The relaxation time diverges like a power law $\\tau\\sim (T-T_c)^{-z\\nu}$ with $T_c=0.19(4)$ and $z\\nu=5.0(5)$. Although our data indicates that the spin-glass transition occurs at the same temperature as the chiral glass transition, we cannot exclude the possibility of a chiral-spin coupling scenario for the lowest frequencies investigated.
Domaines
Autre [cond-mat.other]
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