Advantageous grain boundaries in iron pnictide superconductors

被引：240

作者：

Katase, Takayoshi ^{[1
]}

Ishimaru, Yoshihiro ^{[2
]}

Tsukamoto, Akira ^{[2
]}

Hiramatsu, Hidenori ^{[1
]}

Kamiya, 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：

NATURE COMMUNICATIONS | 2011年 / 2卷

基金：

日本学术振兴会;

关键词：

CRITICAL-CURRENT DENSITY; LAYERED SUPERCONDUCTOR; TRANSPORT; VOLTAGE; FILMS; MGO;

D O I：

10.1038/ncomms1419

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

High critical temperature superconductors have zero power consumption and could be used to produce ideal electric power lines. The principal obstacle in fabricating superconducting wires and tapes is grain boundaries-the misalignment of crystalline orientations at grain boundaries, which is unavoidable for polycrystals, largely deteriorates critical current density. Here we report that high critical temperature iron pnictide superconductors have advantages over cuprates with respect to these grain boundary issues. The transport properties through well-defined bicrystal grain boundary junctions with various misorientation angles (theta(GB)) were systematically investigated for cobalt-doped BaFe2As2 (BaFe2As2:Co) epitaxial films fabricated on bicrystal substrates. The critical current density through bicrystal grain boundary (J(c)(BGB)) remained high (>1MA cm(-2)) and nearly constant up to a critical angle theta(c) of similar to 9 degrees, which is substantially larger than the theta(c) of similar to 5 degrees for YBa2Cu3O7-delta. Even at theta(GB) > theta(c), the decay of J(c)(BGB) was much slower than that of YBa2Cu3O7-delta.

引用

页数：6

共 39 条

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