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Infinite randomness and quantum Griffiths effects in a classical system: The randomly layered Heisenberg magnet

机译:经典系统中的无限随机性和量子格里菲斯效应:随机分层的海森堡磁体

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摘要

We investigate the phase transition in a three-dimensional classical Heisenberg magnet with planar defects, i.e., disorder perfectly correlated in two dimensions. By applying a strong-disorder renormalization group, we show that the critical point has exotic infinite-randomness character. It is accompanied by strong power-law Griffiths singularities. We compute various thermodynamic observables paying particular attention to finite-size effects relevant for an experimental verification of our theory. We also study the critical dynamics within a Langevin equation approach and find it extremely slow. At the critical point, the autocorrelation function decays only logarithmically with time while it follows a nonuniversal power law in the Griffiths phase.
机译:我们研究了具有平面缺陷的三维经典Heisenberg磁体的相变,即在二维上完美相关的无序。通过应用强异常重整化组,我们表明临界点具有奇异的无限随机性。它伴随着强大的幂律格里菲斯奇点。我们计算各种热力学可观测值,并特别注意与理论验证相关的有限尺寸效应。我们还研究了Langevin方程方法中的临界动力学,发现它非常慢。在关键点上,自相关函数仅在时间上呈对数衰减,而在格里菲斯阶段则遵循非通用幂定律。

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