Microstructure and transport properties of [001]-tilt bicrystal grain boundaries in iron pnictide superconductor, cobalt-doped BaFe2As2

被引：28

作者：

Hiramatsu, Hidenori ^{[1
]}

Katase, Takayoshi ^{[1
]}

Ishimaru, Yoshihiro ^{[2
]}

Tsukamoto, Akira ^{[2
]}

Karniya, Toshio ^{[1
]}

Tanabe, Keiichi ^{[2
]}

Hosono, Hideo ^{[1
,3
]}

机构：

[1] Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan

[2] Int Superconduct Technol Ctr, Superconduct Res Lab, Koto Ku, Tokyo 1350062, Japan

[3] Tokyo Inst Technol, Frontier Res Ctr, Midori Ku, Yokohama, Kanagawa 2268503, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS | 2012年 / 177卷 / 07期

关键词：

Pnictide; Thin film; Bicrystal; Grain boundary; Critical current density; LAYERED SUPERCONDUCTOR; THIN-FILMS;

D O I：

10.1016/j.mseb.2011.12.009

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Relationships between microstructure and transport properties of bicrystal grain boundary (BGB) junctions were studied in cobalt-doped BaFe2As2 (BaFe2As2:Co) epitaxial films grown on [001]-tilt bicrystal substrates of MgO and (La, Sr)(Al, Ta)O-3 with misorientation angles theta(GB) = 3-45 degrees The theta(GB) of BaFe2As2:Co BGBs were exactly transferred from those of the bicrystal substrates. No segregation of impurities was detected at the BGB junction interfaces, and the chemical compositions of the BGBs were uniform and the same as those in the bulk film regions. A transition from a strongly-coupled GB behavior to a weak-link behavior was observed in current density-voltage characteristics under self-field around theta(GB)similar to 9. The critical current density decreased from (1.2-1.6) x 10(6) A/cm(2) of the intragrain transport to (0.7-1.1) x 10(5) A/cm(2) of theta(GB) = 45 because supercurrent becomes more governed by Josephson current with increasing theta(GB). (c) 2011 Elsevier B.V. All rights reserved.

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页码：515 / 519

页数：5

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