Scaling the anomalous Hall effect: A connection between transport and magnetism

An unconventional form of scaling-one based on the anomalous Hall effect-in Fe0.8Co0.2Si demonstrates the close correlation between its magnetic and transport properties. In particular, this approach enables the universality class of its magnetic phase transition-in fields above 1 kOe-to be reliably established from the anomalous Hall conductivity, yielding T-C=36.0 +/- 0.5 K, delta=4.78 +/- 0.01, beta=0.37 +/- 0.01, and gamma=1.38 +/- 0.02. These latter estimates are in excellent agreement with those deduced from conventional magnetic measurements over a comparable field range and lead to the inference that in modest fields the dominant interaction in the critical regime becomes near-neighbor isotropic exchange.

在Fe₀.₈Co₀.₂Si中，一种基于反常霍尔效应的非常规标度形式展示了其磁性和输运性质之间的紧密关联。特别是，这种方法能够根据反常霍尔电导率可靠地确定其在高于1 kOe的磁场中的磁相变普适类，得出\(T_C = 36.0 \pm 0.5\)K，\(\delta = 4.78 \pm 0.01\)，\(\beta = 0.37 \pm 0.01\)以及\(\gamma = 1.38 \pm 0.02\)。后面这些估计值与在可比较的磁场范围内从常规磁性测量推断出的值高度吻合，并由此推断在适中的磁场中，临界区域的主要相互作用变为近邻各向同性交换。