论文标题
剥落的超薄黄铁矿中明显的铁磁性
Apparent Ferromagnetism in Exfoliated Ultra-thin Pyrite Sheets
论文作者
论文摘要
各向同性原子上的二维晶体中铁磁有序的实验证据一直缺失，直到双层CR2GE2TE6和三原子厚的单层CRI3被证明在有限温度下保留了铁磁有序。在这里，我们证明了通过液相去角质衍生自天然存在的黄铁矿矿物质（FES2）的非van der waals型超薄纳米片的FES2的超薄纳米片。结构特征表明（111）面向的纸是主要的，理论上通过密度功能理论表面能量计算在理论上得到支持。自旋偏振密度理论的计算进一步预测（111）面向的三原子厚的黄铁矿片具有稳定的铁磁基态与其磁性大量对应物不同的基态。这一理论发现是通过低温超导量子干扰装置测量的实验评估，并观察到异常的铁磁行为。
Experimental evidence for ferromagnetic ordering in isotropic atomically thin two-dimensional crystals has been missing until a bilayer Cr2Ge2Te6, and a three-atom thick monolayer CrI3 are shown to retain ferromagnetic ordering at finite temperatures. Here, we demonstrate successful isolation of a non-van der Waals type ultra-thin nanosheet of FeS2 derived from naturally occurring pyrite mineral (FeS2) by means of liquid-phase exfoliation. Structural characterizations imply that (111) oriented sheets are predominant and is supported theoretically by means of density functional theory surface energy calculations. Spin-polarized density theory calculations further predicted that (111) oriented three-atom thick pyrite sheet has a stable ferromagnetic ground state different from its diamagnetic bulk counterpart. This theoretical finding is evaluated experimentally employing low temperature superconducting quantum interference device measurements and observed an anomalous ferromagnetic kind of behavior.
