多晶Sr1-xKxFe2As2超导体中纳米尺度非晶层和晶界氧化物微晶的直接观察
Direct observation of nanometer-scale amorphous layers and oxide crystallites at grain boundaries in polycrystalline Sr1-xKxFe2As2 superconductors
摘要：
本文报道了用原子分辨方法研究多晶Sr_（0.6）K_（0.4）Fe_2As_2超导体晶界的结构和组成。大部分晶界包含大于相干长度的非晶层，而其他一些晶界包含夹在非晶层之间的纳米级颗粒。我们还发现，有显着的氧富集在晶界。这样的结果解释了相对于双晶薄膜的多晶样品的相对较低的输运临界电流密度（Jc）。
英文摘要：
We report here an atomic resolution study of the structure and composition of the grain boundaries in polycrystalline Sr0.6K0.4Fe2As2 superconductor. A large fraction of grain boundaries contain amorphous layers larger than the coherence length, while some others contain nanometer-scale particles sandwiched in between amorphous layers. We also find that there is significant oxygen enrichment at the grain boundaries. Such results explain the relatively low transport critical current density (Jc) of polycrystalline samples with respect to that of bicrystal films.
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