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    Direct observation of nanometer-scale amorphous layers and oxide crystallites at grain boundaries in polycrystalline Sr1−xKxFe2As2 superconductors

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    Type
    Article
    Authors
    Wang, Lei
    Ma, Yanwei
    Wang, Qingxiao
    Li, Kun
    Zhang, Xixiang cc
    Qi, Yanpeng
    Gao, Zhaoshun
    Zhang, Xianping
    Wang, Dongliang
    Yao, Chao
    Wang, Chunlei
    KAUST Department
    Advanced Nanofabrication, Imaging and Characterization Core Lab
    Imaging and Characterization Core Lab
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2011-06-03
    Preprint Posting Date
    2011-04-28
    Online Publication Date
    2011-06-03
    Print Publication Date
    2011-05-30
    Permanent link to this record
    http://hdl.handle.net/10754/552804
    
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    Abstract
    We report here an atomic resolution study of the structure and composition of the grain boundaries in polycrystallineSr0.6K0.4Fe2As2superconductor. A large fraction of grain boundaries contain amorphous layers larger than the coherence length, while some others contain nanometer-scale crystallites 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.
    Citation
    Direct observation of nanometer-scale amorphous layers and oxide crystallites at grain boundaries in polycrystalline Sr1−xKxFe2As2 superconductors 2011, 98 (22):222504 Applied Physics Letters
    Publisher
    AIP Publishing
    Journal
    Applied Physics Letters
    DOI
    10.1063/1.3592580
    arXiv
    1104.5372
    Additional Links
    http://scitation.aip.org/content/aip/journal/apl/98/22/10.1063/1.3592580
    http://arxiv.org/abs/1104.5372
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.3592580
    Scopus Count
    Collections
    Articles; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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