When a spin glass is cooled down, a memory of the cooling process is imprinted in the spin structure. This memory can be disclosed in a continuous heating measurement of the ac-susceptibility. E.g., if a continuous cooling process is intermittently halted during a certain aging time at one or two intermediate temperatures, the trace of the previous stop(s) is recovered when the sample is continuously re-heated [#!uppsalaSaclay!#]. However, heating the sample above the aging temperature, but keeping it below , erases the memory of the thermal history at lower temperatures. We also show that a memory imprinted at a higher temperature can be erased by waiting a long enough time at a lower temperature. Predictions from two complementary spin glass descriptions, a hierarchical phase space model and a real space droplet picture are contested with these memory phenomena and interference effects.When a spin glass is cooled down, a memory of the cooling process is imprinted in the spin structure. This memory can be disclosed in a continuous heating measurement of the ac-susceptibility. E.g., if a continuous cooling process is intermittently halted during a certain aging time at one or two intermediate temperatures, the trace of the previous stop(s) is recovered when the sample is continuously re-heated [#!uppsalaSaclay!#]. However, heating the sample above the aging temperature, but keeping it below , erases the memory of the thermal history at lower temperatures. We also show that a memory imprinted at a higher temperature can be erased by waiting a long enough time at a lower temperature. Predictions from two complementary spin glass descriptions, a hierarchical phase space model and a real space droplet picture are contested with these memory phenomena and interference effects.

Jan 1, 199923 citations

Relaxation in quantum spin glasses

Bosiljka Tadić, R. Pirc, R. Blinc +1 more

Journal of Non-Crystalline SolidsSep 1, 19940 citations

Numerical Study on Aging Dynamics in the 3D Ising Spin–Glass Model: III. Cumulative Memory and `Chaos' Effects in the Temperature-Shift Protocol

Hajime Takayama, Koji Hukushima

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, $ΔT$ , 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 $ΔT$ 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.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, $ΔT$, 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 $ΔT$ 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.

arXiv:cond-mat/0205276Journal of the Physical Society of JapanDec 15, 200227 citations

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,

ΔT

, 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

ΔT

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.