Field-Shift Aging Protocol on 3D Ising Spin-Glass Model : Dynamical Crossover between the Spin-Glass and Paramagnetic States(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

概要

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The spin-glass (SG) states of the three-dimensional Ising Edwards-Anderson model under a static magnetic field h are examined by the standard Monte Carlo simulation of the field-shift aging protocol at temperature T. For each process with (T ; t_w, h), t_w being the waiting time before the field is switched on, we extract the dynamical crossover time, t_<cr>(T ; t_w, h). We have found a good scaling relation between the two characteristic length scales which are properly determined from t_<cr> and t_w and then are normalized by the static field crossover length introduced in the SG droplet theory. This scaling behavior implies the instability of the SG phase in the equilibrium limit even under an infinitesimal h. In comparison with this numerical result the field effect on real spin glasses is also discussed.
社団法人日本物理学会の論文
2004-08-15