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

Lei Wang | Zendy; Yanwei Ma | Zendy; Qingxiao Wang | Zendy; Kun Li | Zendy; Xixiang Zhang | Zendy; Yanpeng Qi | Zendy; Zhaoshun Gao | Zendy; Xianping Zhang | Zendy; Dongliang Wang | Zendy; Chao Yao | Zendy; Chunlei Wang | Zendy

Open Access

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

Author(s) -

Lei Wang,

Yanwei Ma,

Qingxiao Wang,

Kun Li,

Xixiang Zhang,

Yanpeng Qi,

Zhaoshun Gao,

Xianping Zhang,

Dongliang Wang,

Chao Yao,

Chunlei Wang

Publication year - 2011

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.3592580

Subject(s) - crystallite , grain boundary , materials science , coherence length , amorphous solid , nanometre , superconductivity , condensed matter physics , oxide , grain size , crystallography , composite material , microstructure , metallurgy , chemistry , physics

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

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research