Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2002-05-14
Physics
Condensed Matter
Disordered Systems and Neural Networks
8 pages, 5 figures
Scientific paper
10.1143/JPSJ.71.3003
The temperature ($T$)-shift protcol of aging in the 3 dimensional (3D) Edwards- Anderson (EA) spin-glass (SG) model is studied through the out-of-phase component of the ac susceptibility simulated by the Monte Carlo method. For processes with a small magnitude of the $T$-shift, $\Delta T$, the memory imprinted before the $T$-shift is preserved under the $T$-change and the SG short-range order continuously grows after the $T$-shift, which we call the cumulative memory scenario. For a negative $T$-shift process with a large $\Delta T$ the deviation from the cumulative memory scenario has been observed for the first time in the numerical simulation. We attribute the phenomenon to the `chaos effect' which, we argue, is qualitatively different from the so-called rejuvenation effect observed just after the $T$-shift.
Hukushima Koji
Takayama Hajime
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