Distinct in-plane resistivity anisotropy in a detwinned FeTe single crystal: Evidence for a Hund's metal

作者：Juan Jiang, C. He, Yiting Zhang, Mingyu Xu, Q. Q. Ge, Z. R. Ye, F. Chen, B. P. Xie, Donglai Feng · 发表于：Physical Review B · 年份：2013 · DOI：10.1103/physrevb.88.115130 · 被引用次数：39 · 研究领域：Iron-based superconductors research、Rare-earth and actinide compounds、Magnetic and transport properties of perovskites and related materials

The in-plane resistivity anisotropy has been studied with the Montgomery method on the detwinned parent compound of the iron-based superconductor FeTe. The observed resistivity in the antiferromagnetic (AFM) direction is larger than that in the ferromagnetic (FM) direction, which is different from that observed in BaFe${}_{2}$As${}_{2}$ before. We show that the opposite resistivity anisotropy behavior in FeTe could be attributed to the strong Hund's rule coupling effects, which should be understood in a localized picture: Hund's rule coupling makes hopping along the FM direction easier than along the AFM direction in FeTe, similar to the colossal magnetoresistance observed in some manganites.