准一维铁硫系化合物BaFe $_{2}$ Se $_{4}$的倾斜反铁磁性
Canted Antiferromagnetism in the Quasi-1D Iron Chalcogenide BaFe$_{2}$Se$_{4}$
摘要：
报道了准一维铁硫属化合物$\rm BaFe_2Se_4$的合成和物理性质研究。$\rm BaFe_2Se_4$具有铁硫属化合物超导体中常见的$\rm FeSe_4$四面体结构。采用固相反应法制备了高质量的多晶样品，并通过X射线衍射、电阻率、磁化率和中子衍射等测试手段对样品进行了表征。$\rm BaFe_2Se_4$是在$\sim$ 310 K下磁性有序的窄禁带半导体。中子粉末衍射结果和等温M-H环都表明了一种倾斜的反铁磁结构，其中Fe亚晶格沿c轴准一维链方向反铁磁有序，导致沿a轴垂直方向的净铁磁矩与b轴的倾斜角为18.7 $^\circ$。
英文摘要：
We report the synthesis and physical properties studies of quais-1D iron chalcogenide $\rm BaFe_2Se_4$ which shares the $\rm FeSe_4$ tetrahedra building motif commonly seen in the iron chalcogenide superconductors. A high-quality polycrystalline sample was achieved by solid-state reaction method and characterized by X-ray diffraction, electrical resistivity, magnetic susceptibility and neutron diffraction measurements. $\rm BaFe_2Se_4$ is a narrow gap semiconductor that magnetically orders at $\sim$ 310 K. Both neutron powder diffraction results and isothermal M-H loops suggest a canted antiferromagnetic structure where Fe sublattice are antiferromagnetically ordered along the c-axis quasi-1D chain direction, resulting in a net ferromagnetic moment in the perpendicular direction along the a-axis with tilted angle of 18.7$^\circ$ towards the b-axis.
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