Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
Phys Rev Lett. 2013 Jul 19;111(3):036602. doi: 10.1103/PhysRevLett.111.036602. Epub 2013 Jul 17.
We study the anomalous Hall effect due to noncoplanar magnetism on a pyrochlore structure. We focus on the frustration-induced spatial inhomogeneity of different magnetic low-temperature regimes, between which one can efficiently tune using an external magnetic field. We incorporate nonmagnetic scattering on a phenomenological level so that we can distinguish between the effects of short-range correlations and short-range coherence. We obtain a Hall conductivity (σ(H)) as a function of field strength and direction which compares well to the experimental data of Pr(2)Ir(2)O(7). In particular, we show that the observed peak in σ(H) for H[parallel][111] signals the crossover from zero-field spin ice to kagome ice.
我们研究了反铁磁共振与非共面磁性在钙钛矿结构上的关系。我们关注的是低温磁态之间由反铁磁相互作用引起的空间不均匀性，通过外加磁场可以有效地对其进行调控。我们在唯象的层面上引入了非磁性散射，以区分短程关联和短程有序的影响。我们得到了霍尔电导率(σ(H))作为磁场强度和方向的函数，与 Pr(2)Ir(2)O(7)的实验数据吻合较好。特别是，我们发现 σ(H)在 H[parallel][111]方向上的峰值表明了零场自旋冰到 kagome 冰的转变。
