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

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

doi:10.1063/1.3592580

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

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

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30 Scopus citations

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.

Original language	English (US)
Pages (from-to)	222504
Journal	Applied Physics Letters
Volume	98
Issue number	22
DOIs	https://doi.org/10.1063/1.3592580
State	Published - Jun 3 2011

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.3592580

https://repository.kaust.edu.sa/bitstream/10754/552804/1/1.3592580.pdf

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

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.",

author = "Lei Wang and Yanwei Ma and Qingxiao Wang and Kun Li and Xixiang Zhang and Yanpeng Qi and Zhaoshun Gao and Xianping Zhang and Dongliang Wang and Chao Yao and Chunlei Wang",

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T1 - Direct observation of nanometer-scale amorphous layers and oxide crystallites at grain boundaries in polycrystalline Sr1−xKxFe2As2 superconductors

AU - Wang, Lei

AU - Ma, Yanwei

AU - Wang, Qingxiao

AU - Li, Kun

AU - Zhang, Xixiang

AU - Qi, Yanpeng

AU - Gao, Zhaoshun

AU - Zhang, Xianping

AU - Wang, Dongliang

AU - Yao, Chao

AU - Wang, Chunlei

N1 - KAUST Repository Item: Exported on 2020-10-01

PY - 2011/6/3

Y1 - 2011/6/3

N2 - 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.

AB - 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.

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U2 - 10.1063/1.3592580

DO - 10.1063/1.3592580

M3 - Article

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JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 22

ER -

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

Abstract

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