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

By Lei Wang, Yanwei Ma, Qingxiao Wang, Kun Li, Xixiang Zhang, Y. Qi, Z. Gao, Xianping Zhang, Dongliang Wang, C. Yao and 1 more. 2011

228 citations recorded by the source corpus.

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.

Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/f570aaa878310472073ed68ba8fc0f5725c01566

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In Condensed Matter Physics

1. P. Amiri
2. Kang L. Wang

In Electronic, Optical and Magnetic Materials

1. P. Amiri
2. Kang L. Wang
3. C. Lynch

In Materials Chemistry

1. Kang L. Wang
2. P. Amiri
3. C. Lynch

Citations in the corpus

• Electrical control of reversible and permanent magnetization reorientation for magnetoelectric memory devices (2011, background): “Recently, Wu et al.11 experimentally demonstrated an electric field induced reversible and permanent transition from a magnetic isotropic easy plane to an uniaxial magnetic anisotropy in Ni/(011) [Pb(Mg1/3Nb2/3)O3](1 x) [PbTiO3]x (PMN-PT, x 0.32) ME heterostructure.”