Fluctuation-dissipation ratio of a spin glass in the aging regime.
Fluctuation-dissipation ratio of a spin glass in the aging regime.
复制标题
老化状态下旋转玻璃的波动耗散比。
DOI：
10.1103/physrevlett.88.257202
复制
发表时间：
2001
影响因子：
8.6
通讯作者：
M. Ocio
中科院分区：
文献类型：
--
作者：
D. Hérisson;M. Ocio
我们提出了第一个实验测定的时间自相关C（t '，t）的磁化在非稳态制度的自旋玻璃。定量比较的响应，磁化率chi（t '，t），是通过使用一个新的实验装置，允许在相同的条件下进行测量。显然，我们观察到C和chi之间的非线性波动耗散关系，弱依赖于等待时间t '。随着平均场模型和最近的短程模型的理论发展，人们预测，在长时间的极限下，chi（C）关系应该变得与t '无关。缩放过程允许我们外推到长等待时间的极限。
We present the first experimental determination of the time autocorrelation C(t',t) of magnetization in the nonstationary regime of a spin glass. Quantitative comparison with the response, the magnetic susceptibility chi(t',t), is made by using a new experimental setup allowing both measurements in the same conditions. Clearly, we observe a nonlinear fluctuation-dissipation relation between C and chi, depending weakly on the waiting time t'. Following theoretical developments on mean-field models, and lately on short range ones, it is predicted that in the limit of long times the chi(C) relationship should become independent of t'. A scaling procedure allows us to extrapolate to the limit of long waiting times.