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arXiv 0903.0795cond-mat.dis-nn
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T=0 RFIM中的滞后:超越亚稳态动力学

Hysteresis in the T=0 RFIM: beyond metastable dynamics

F. Salvat-Pujol, E. Vives, M. L. Rosinberg

摘要:

我们提出了一个数值研究的零温度响应的高斯随机场伊辛模型(RISK)的一个缓慢变化的外场,使系统被困在微观配置,不完全亚稳。标准单自旋翻转动力学的这种修改导致耗散(滞后)的增加,有点类似于有限驱动速率下观察到的情况。然后,我们研究了沿滞后回线的雪崩分布,并进行了有限尺寸标度分析,显示了很好的证据表明,与无序引起的相变的临界指数没有修改。

英文摘要:

We present a numerical study of the zero-temperature response of the Gaussian random-field Ising model (RFIM) to a slowly varying external field, allowing the system to be trapped in microscopic configurations that are not fully metastable. This modification of the standard single-spin-flip dynamics results in an increase of dissipation (hysteresis) somewhat similar to that observed with a finite driving rate. We then study the distribution of avalanches along the hysteresis loop and perform a finite-size scaling analysis that shows good evidence that the critical exponents associated to the disorder-induced phase transition are not modified.

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