利用横向NMR弛豫观测磁结构普适性
Observation of magnetic structural universality using transverse NMR relaxation
摘要：
自旋在随机磁介质中扩散的横向NMR弛豫对介观尺度上的结构很敏感。特别地，这导致依赖于时间的弛豫速率。我们分析和数值计算表明，这个速率接近长时间的限制，在幂律的方式，与指数反映的介观磁结构的无序类。谱线形状在零频率处获得相应的非解析幂律奇异性。我们通过实验检测到的动态指数的变化，作为过渡到一个最大的随机堵塞状态，其特征在于超均匀相关的结果。
英文摘要：
Transverse NMR relaxation from spins diffusing through a random magnetic medium is sensitive to its structure on a mesoscopic scale. In particular, this results in the time-dependent relaxation rate. We show analytically and numerically that this rate approaches the long-time limit in a power-law fashion, with the exponent reflecting the disorder class of mesoscopic magnetic structure. The spectral line shape acquires a corresponding non-analytic power law singularity at zero frequency. We experimentally detect a change in the dynamical exponent as a result of the transition into a maximally random jammed state characterized by hyperuniform correlations.
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